Guide for portable toilet rental companies · checked 30 October 2026
Portable toilet rental, run by the numbers: units, routes, gallons and 28-day cycles
A portable restroom operator (a PRO, in the trade) rents a plastic box with a 60-gallon tank and then owes it a visit every week until it comes back to the yard. This guide covers how many units a site or event needs, how a route truck's fresh-water tank sets the day, where the waste is allowed to go, and how the rent gets billed.
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Short answer
Portable toilet rental companies usually run on route software built for the trade, such as ServiceCore, CRO Software, The Service Program or stopSuite, or on enterprise waste platforms like Routeware and AMCS. The software has to track every unit by serial number and location, generate the weekly service stops, bill rent on 28-day cycles (83% of operators did in the 2022 industry benchmark), and keep disposal manifests for every load. General field service apps handle the service visits but usually not the rented units.
1 per 10
ANSI Z4.3 work-site minimum: one toilet per 10 workers for a 40-hour week, if serviced once a week
source: ANSI/PSAI Z4.3-2016, Portable sanitation at work sites
20-30 gal
Service a 60-gallon tank when 20-30 gallons are in it, charge included (about 200-250 uses)
5%
Share of units at an event that must be ADA accessible, rounded up, at least one per cluster
source: US Access Board, Guide to the ADA Standards, Chapter 6 toilet rooms
13 bills
A 28-day billing cycle makes 13 invoices a year instead of 12
How a job runs
One portable toilet rental job, from first call to paid
The order the work really happens in, and what has to be written down at each step so nothing is argued about later.
- 1
Size the order
For a construction site, count the peak workers on a regular 40-hour week shift and apply ANSI Z4.3 Table 1 (1-10 workers: 1 unit; 11-20: 2; then one more per 10). For an event, read the PSAI special event chart by crowd size and hours, add 10-20% if alcohol is served, and make 5% of the total ADA units, rounded up. Add hand wash stations from Z4.3 Table 2.
- 2
Quote and contract
Quote per unit per 28-day cycle with weekly service included, plus delivery and pickup fees, extra-service rates, and a damage clause. PSAI says a written rental agreement should spell out the equipment, delivery and servicing schedule, emergency contacts and billing schedule.
- 3
Assign units from the yard
Pick specific units (by serial or QR tag) of the right type: standard, flushing, ADA, hand wash station, holding tank or restroom trailer. Check availability on the calendar against other bookings before saying yes to a 300-unit festival.
- 4
Deliver and drop a pin
The driver places each unit on flat ground the service truck can reach, records GPS and a photo, tethers no more than two units together in windy spots (Z4.3 5.9), and notes gate codes. The 28-day rental clock starts on the delivery date.
- 5
Build the weekly route
Every active unit generates a stop on its service day. Group stops so the truck's fresh-water tank, not the waste tank, runs out at the dump site: at about 7 gallons of fresh water per full service, a 400-gallon fresh tank covers roughly 57 toilets.
- 6
Service the unit
Pump the tank completely, clean and sanitize the interior, recharge with water and deodorizer (the 'charge', 5-10 gallons), restock paper and sanitizer, and check the door latch, vent and urinal. Hand wash stations are drained, sanitized and refilled with water that was potable when it went on the truck.
- 7
Record the visit
Time-stamped, geo-located stop verification, a photo, and a note for anything abnormal: locked gate, unit blocked, tipped, vandalised, overused. These notes are what justify an extra-service or damage charge later.
- 8
Dump the load
Discharge at a permitted septage receiving station or treatment plant, fill in its manifest for that load (UOSA, for example, wants one complete manifest per load and revokes permits for falsified ones), and keep the receipt with gallons, date and the jurisdictions the waste came from.
- 9
Bill the cycle
On each unit's 28-day anniversary, invoice rent plus any extra services, damage and fuel or environmental fees. Many operators run one billing batch a week for every anniversary that fell in it.
- 10
Pick up and close out
On the off-rent call, add a final pump and pickup stop, prorate the last partial cycle, inspect the unit in the yard, and put it back into available inventory or into repair.
What to record
The fields every portable toilet rental job should capture
Per unit (the asset record)
- Serial number or QR tag, unit type (standard, flushing, ADA, hand wash station, holding tank, trailer) and colour
- Tank capacity (commonly 60-70 gallons for a standard unit; hand wash stations and holding tanks differ)
- Status: in yard, on rent, needs repair, out of service
- Current site, GPS pin and placement photo
- Service day and frequency (weekly, twice weekly, event-only)
- Repair history: doors, latches, vent stacks, urinals, graffiti
Each service stop
- Date, time and GPS stamp (proof the stop happened)
- Pumped, cleaned, recharged, restocked: yes or no for each
- Approximate gallons removed and whether the unit was overused
- Hand sanitizer or soap and towel levels refilled
- Exceptions: locked gate, blocked access, tipped, vandalised, frozen
- Photo of the unit after service, and of any damage
- Winter: brine or methanol mix used in the charge
Each truck load and disposal
- Truck, driver, waste and fresh-water tank sizes
- Receiving station name, permit number, date and time
- Gallons discharged and, where required, gallons per originating county
- Manifest number and receipt photo
- Deodorizer product used and its safety data sheet on file
- If land applied: site, acres, crop nitrogen need, gallons per acre, pathogen and vector method, signed certification
Each rental contract
- Customer, site contact, delivery address and access notes
- Units by type and count, ADA and hand wash count
- Rental start date (sets the 28-day anniversary) and expected end
- Rate per unit per cycle, extra-service rate, delivery and pickup fees
- Damage, tip-over and vandalism terms
- Payment method on file
Rules and standards
The rules that shape the work, with their sources
| Rule | What it means on the job |
|---|---|
| OSHA 29 CFR 1926.51(c), construction toilets | Table D-1: 20 or fewer employees, 1 toilet; 20 or more, 1 toilet seat and 1 urinal per 40 workers; 200 or more, 1 seat and 1 urinal per 50. Mobile crews with transport readily available to nearby toilets are exempt. Where there is no sewer, chemical, recirculating or combustion toilets may be used. source: 29 CFR 1926.51, Sanitation (OSHA construction) |
| ANSI/PSAI Z4.3, Table 1 (stricter than OSHA) | Units serviced once a week: 1-10 workers 1 unit, 11-20 2, 21-30 3, 31-40 4, then 1 more per 10. Serviced more than once a week: 1-15 1, 16-35 2, 36-55 3, 56-75 4, 76-95 5, then 1 more per 20. Construction crews are not 'mobile' and must be counted. Each employer on a multi-contractor site counts its own workers. A 2025 edition is now published; the numbers here are from the 2016 text. source: ANSI/PSAI Z4.3-2016, Portable sanitation at work sites |
| ANSI/PSAI Z4.3, unit construction | Minimum inside size 3 ft by 3 ft, 6 ft 6 in clear height, seat riser 14-20 in. Tank vented to the outside with at least 7 sq in of vent area, plus a screened vent of at least 1 sq ft per fixture. Inside latch, hinged seat lid, toilet paper holder. source: ANSI/PSAI Z4.3-2016, Portable sanitation at work sites |
| ANSI/PSAI Z4.3, Table 2 hand wash stations | 1-10 toilets: 1 hand wash station; 11-20: 2; 21-30: 3; 31-40: 4; then 1 more per 10. Each station needs at least one faucet, a 'not for consumption' label, soap and towels, and the standard says sanitize with a 10% bleach solution at a maximum of 45 days. source: ANSI/PSAI Z4.3-2016, Portable sanitation at work sites |
| 2010 ADA Standards, 213.2 Exception (portable units) | Where single-user portable toilets are clustered, at least 5% (and no fewer than one) in each cluster must be accessible and labelled with the International Symbol of Accessibility. Units used only by construction personnel on a construction site are exempt. Z4.3 applies the same 5% to the total rented for events, rounded up. source: US Access Board, Guide to the ADA Standards, Chapter 6 toilet rooms |
| EPA 40 CFR Part 503, domestic septage | Portable toilet waste counts as domestic septage when the unit receives only domestic sewage. If land applied, the annual rate is capped at AAR = N / 0.0026 gallons per acre (N = crop nitrogen need in lb per acre), and the applier keeps site, acres, dates, rate and a signed certification for five years. source: 40 CFR 503.17, recordkeeping |
| Part 503 pathogen and site rules for septage | Either raise pH to 12 or higher and hold it 30 minutes without more lime, or follow site restrictions: no grazing for 30 days, no harvest of feed or fibre crops for 30 days, 14 months for food crops touching the soil, and public access restricted for a year on high-exposure land. source: 40 CFR 503.32, pathogens and site restrictions |
| Receiving station permits and manifests | Treatment plants set their own terms. UOSA in Virginia charges a $30 per vehicle permit and at least $26 per thousand gallons, bans portable toilet waste containing formaldehyde or 1,4-dichlorobenzene, wants the deodorizer's safety data sheet, and only takes loads from four jurisdictions ($220 and a violation notice otherwise). source: UOSA septage receiving facility registration and rules (2027) |
| California Health and Safety Code 25210 (AB 1824) | Bans use and sale for chemical toilets of bronopol, dowicil, formaldehyde, glutaraldehyde, para-formaldehyde and para-dichlorobenzene. Operators in California use other deodorizer chemistries. source: California AB 1824 (2010), chemical toilet additives, H&SC 25210 |
| State licensing (two examples) | Illinois: portable sanitation business licence $250 a year and technician certification $50 a year, renewed by 30 April. Wisconsin: septage businesses that service portable restrooms are licensed under NR 113; portable restroom servicing assistants are exempt from operator certification but must work under a certified operator-in-charge and cannot land apply. source: Ill. Admin. Code tit. 77, 905.200, licenses and fees |
Rules vary by state, council and contract. Checked 30 October 2026; confirm against the source for your area before relying on it.
Numbers
Sizing, servicing and truck numbers
The reference figures operators actually quote from. Event counts assume no pumping during the event and a 50/50 mix of men and women. The truck rows are a worked example from a PSAI conference session, not a standard.
| Situation | Number | Basis |
|---|---|---|
| Average user | 1 use per 4 hours, 8-12 oz per use | PSAI guide |
| Capacity of one standard unit | About 200-250 uses; service at 20-30 gal in a 60-gal tank | PSAI guide |
| Event, 500 people, 4 hours | 5 units | PSAI special event chart |
| Event, 2,000 people, 6 hours | 16 units | PSAI special event chart |
| Event, 10,000 people, 8 hours | 100 units | PSAI special event chart |
| Event, 50,000 people, 10 hours | 626 units | PSAI extended chart |
| Alcohol served | Add 10-20% more units | PSAI guide |
| Hot weather, heavy food and drink | Restroom visits up 30-40% | PSAI guide |
| Site, 35 workers, serviced weekly | 4 units (ANSI); OSHA minimum is 1 seat + 1 urinal | Z4.3 Table 1 vs 1926.51 |
| Same site, serviced twice a week | 2 units (ANSI 16-35 band) | Z4.3 Table 1 |
| Two 8-hour shifts, 21-30 workers | 6 units | PSAI guide (Z4.3 shift table) |
| Route truck, 1,100-gal waste / 400-gal fresh | ~157 pumped by waste, ~57 full services by fresh water | Worked example: 7 gal each per service |
| Hand wash station / holding tank | ~22 gal / ~250 gal per service | Same PSAI session |
| Salt brine in the charge | 0.5 lb/gal protects to 26 F; about 2.25 lb/gal (saturated) to 0 F | PolyJohn |
| Methanol + salt | 2 lb salt + 40 oz methanol per gal protects to -40 F | PolyJohn |
source: PSAI Guide to Portable Restroom Excellence (2016)source: PSAI Special Event Chart, extended breakdownsource: ANSI/PSAI Z4.3-2016, Portable sanitation at work sitessource: 29 CFR 1926.51, Sanitation (OSHA construction)source: PSAI 2020 CTS session, Choosing the Right Truck for the Jobsource: PolyJohn, Winterization: preparing for the big chill
Where it breaks
Where spreadsheets and generic software fall over
Rent is billed off the calendar month. Units delivered on the 9th and pulled on the 20th of the next month get billed for the wrong days, and an operator on monthly billing gives away the 13th cycle.
Store the delivery date on every unit-on-rent line and bill on its own 28-day anniversary, with automatic proration of the first and last partial cycle and a weekly billing batch.
Units live in a spreadsheet by count, not by serial. Nobody knows which 40 of the 300 units are on the festival grounds, which ones came back cracked, or whether the yard can cover a new bid.
One record per unit with status and GPS pin, updated by the driver's app on delivery, service and pickup, and an availability calendar per unit type.
A general field service app treats each weekly service as a separate job someone has to schedule. With 600 units on weekly service, that is 600 jobs to create every week.
Generate stops from active rentals automatically on each unit's service day, and only hand-schedule exceptions like extra pumps and event cleanings.
Routes are built by stop count. The truck runs out of fresh water at stop 50 with its waste tank half empty, 30 miles from the yard.
Plan each route against the truck's fresh and waste gallons, with heavier allowances for sinks, hand wash stations and holding tanks, and place the dump site run where the tank fills.
Damage and tip-overs are argued months later. The customer says the door was broken when it arrived and there is no photo.
Require a time-stamped photo at delivery and at every exception stop, attach it to the unit and the invoice line, and bill damage from that evidence.
Disposal records sit in a glovebox. When the plant audits gallons by county, or the state asks for land application records, the receipts are incomplete.
Capture each manifest and receipt photo in the driver app per load, with gallons and originating jurisdictions, and keep land application records for five years.
Checklist
The portable toilet rental operations checklist
Print it, or hand it to whoever runs the office side.
- Every unit has a serial or QR tag, a type and a status
- Construction quotes sized with ANSI Z4.3 Table 1, not just the OSHA minimum
- Event quotes sized from the PSAI chart, plus 10-20% where alcohol is served
- At least 5% ADA units per cluster at public events, rounded up, ISA-labelled
- Hand wash stations quoted per Z4.3 Table 2
- Rental start date stored per unit line; billing on 28-day anniversaries
- Weekly service stops generated automatically from active rentals
- Routes planned against fresh-water and waste gallons per truck
- Driver app records GPS, time and photo at every stop, offline
- Exception codes for locked gate, blocked, tipped, vandalised, frozen
- Manifest and receipt captured for every load, with gallons by jurisdiction
- Deodorizer SDS on file for each receiving station; no formaldehyde where banned
- Winter brine or methanol mix set weekly from the 7-day forecast from November
- Technician licences and PSAI certifications tracked with renewal dates
Software options
What software portable toilet rental companies actually use
Judge each one on whether it fits the way your jobs run, not on the feature list. Bring a real job to every demo.
ServiceCore
Portable restroom, septic, grease and dumpster operators (US)
Built for PROs: units on a map with or without serial numbers, availability by product line, driver app with time-stamped damage photos, route optimization, customer portal and 28-day billing. Publishes the industry benchmark report. A strong default if your work is mostly portables.
CRO Software (RapidWorks)
Larger portable toilet and site-service operators
Routing, drag-and-drop dispatch and asset tracking, invoices generated from completed field activity, QuickBooks Online and Desktop sync, and a customer self-service portal. Says it has 700+ customers. Pricing is not published.
The Service Program
Portable toilet and septic operators, often QuickBooks Desktop shops
Listed in the PSAI supplier directory. Two-way QuickBooks Desktop and Online sync, route schedules, units and tanks on a map, stop verification with time, date and geocode, and field payments.
stopSuite
Route-based fleet businesses, including portable restrooms
Unit tracking by serial number, location and status, event delivery and pickup scheduling, weekly service routes with verification, and automated rental-period billing including mailed invoices.
Routeware or AMCS
Multi-line waste and site-service companies (roll-off, septic, grease, portables)
Enterprise waste platforms. AMCS lists 28-day and anniversary billing, automatic proration and a customer portal; Routeware covers portable units with septic, grease, fencing and roll-off. Worth it when portables are one line of a larger waste business.
A general field service app
Small operators who also do other trades
Apps like Jobber or Housecall Pro handle customers, visits and invoices well, but they are built around jobs, not rented units. Expect to track unit serials, 28-day rent and disposal manifests somewhere else.
Questions to ask any vendor
- Can you bill rent on each unit's own 28-day anniversary, prorate partial cycles, and run a weekly billing batch?
- Do you track each unit by serial number or QR code with status and GPS, and show availability by unit type on a calendar?
- Are weekly service stops generated automatically from active rentals, or does someone have to create them?
- Can routes be planned against each truck's fresh-water and waste tank gallons and the dump site location?
- Does the driver app work offline and capture a time, GPS stamp and photo at every stop, including exceptions?
- Where do disposal manifests, receipts and land application records live, and can I export them for an audit?
Bring one real portable toilet rental job. We show it running in Fieldproxy.
Get DemoHow Fieldproxy is set up for this
Portable toilet rental on Fieldproxy: built around how you already work
A Fieldproxy setup for a portable restroom operator is built around the unit, not the job: every toilet, hand wash station, holding tank and trailer is a tracked asset, every active rental line generates its own service stops and its own 28-day rent, and every truck load ends in a manifest. Fieldproxy builds the screens, statuses and documents to match how your yard, routes and office already run, and has you live in weeks.
Module 1
Order intake by job type
A construction site, a three-day festival and a holding-tank install are different orders with different questions, and the wrong question costs a second truck trip.
- Order record with type: Construction (long-term), Special event, Holding tank / office trailer, Restroom trailer, Emergency or disaster
- Construction fields: general contractor, site address and pin, peak workers on a 40-hour shift, number of shifts, subcontractors counted separately, expected duration, site contact and gate code
- Event fields: expected attendance, hours, single or multi-day, alcohol served (yes/no), all-at-once traffic (race start, concert interval), volunteers and vendors, public accommodation (triggers ADA), surface (grass, gravel, asphalt) and truck access
- Holding tank fields: tank gallons, connected fixtures, pump frequency, access hose length
- Statuses: Enquiry, Sized, Quoted, Accepted, Scheduled for delivery, On rent, Off-rent requested, Picked up, Closed
- Customers can order from a public link or portal form that uses the same fields
Module 2
Sizing calculator on the quote
Unit counts come from tables, and a quote that ignores them gets either undersized complaints or lost bids.
- Construction: computes ANSI/PSAI Z4.3 Table 1 count from peak workers and service frequency (weekly: 1 per 10; more than weekly: the 1-15, 16-35, 36-55 bands then 1 per 20), multiplied by shifts, and shows the OSHA 1926.51 Table D-1 minimum beside it
- Event: looks up the PSAI special event chart by crowd size and hours, adds a configurable 10-20% when alcohol is served, and flags all-at-once traffic for a manual bump
- ADA: 5% of units per cluster, rounded up, minimum one, skipped automatically for construction-personnel-only sites
- Hand wash stations from Z4.3 Table 2 (1 per 1-10 toilets, then 1 more per 10)
- Output line items: standard units, ADA units, hand wash stations, flushing units, trailers, delivery, pickup, extra-service rate, damage waiver
- Quote PDF from your own template, with the basis printed (for example 'Z4.3 Table 1, 35 workers, weekly service = 4 units')
Module 3
Unit register by serial and QR
The rent, the service stop and the damage charge all hang off one physical unit, so the unit is the record everything links to.
- Unit record: serial number, QR tag, type (standard, flushing, ADA, hand wash, holding tank, restroom trailer), colour, tank gallons, purchase date, current site
- Statuses: In yard - clean, In yard - needs wash, On rent, Needs repair, Out of service, Retired, Missing
- Location history: every delivery, service, move and pickup writes GPS, time, driver and photo, so the last known spot of a missing unit is one tap away
- Availability calendar by unit type, counting units already promised to future events
- Repair log: door, latch, vent stack, urinal, seat, graffiti, burn damage, with parts used and cost
- Utilisation report: days on rent per unit per year, units idle in the yard over 30 days
Module 4
Recurring service routes
Weekly service is the product. Six hundred units on weekly service should never mean someone creating six hundred jobs.
- Each on-rent line carries service day and frequency (weekly, twice weekly, daily during event, pump-only, on call)
- Service stops generate automatically for every active line and stop the day the off-rent is recorded
- Delivery and pickup stops share the route with service stops; pickups include a final pump
- Event plans: delivery the day before, cleanings during the event at set hours, pump-out and pickup after
- Missed-stop status with reason codes: locked gate, blocked by equipment, unit not found, site closed, weather
- Route sheet and map per truck per day, re-sequenced when an emergency pump is added
Module 5
Truck capacity and dump-site trips
A route truck runs out of fresh water before it runs out of waste room, and a dump trip in the wrong place costs an hour.
- Truck record: waste tank gallons, fresh tank gallons, CDL or non-CDL, annual DOT inspection date
- Per-stop allowances in gallons (configurable, for example 7 waste and 7 fresh per standard unit, about 22 for a hand wash station, about 250 for a holding tank)
- Running totals on the route so dispatch sees where the fresh tank empties and where the waste tank fills
- Disposal sites with permit numbers, hours, accepted waste, accepted jurisdictions and fee per thousand gallons
- Planned dump trips inserted into the route at the stop where the tank reaches its limit
Module 6
Driver app and per-unit service checklist
Proof of service is a photo, a GPS stamp and a checklist, collected on a fairground or a site with no signal.
- Scan the unit's QR or pick it from the stop; the app confirms it is the unit on that rental
- Standard unit checklist: pumped, interior washed, recharged (gallons of charge), paper restocked, sanitizer refilled, latch, vent and urinal checked
- Hand wash station checklist: grey water drained, tank sanitized, refilled with water potable at loading, soap and towels restocked, 'not for consumption' label present
- Holding tank checklist: gallons pumped, level before pumping, alarm tested
- Required after-service photo; exception photo required for any reason code
- Works offline with photos, signatures and GPS, and syncs when back in signal
Module 7
Septage manifests and disposal records
Treatment plants audit gallons by origin, some ban formaldehyde deodorizers, and land application records must be kept five years.
- Load record per discharge: truck, driver, disposal site, date and time, gallons, gallons per originating county or city
- Manifest number and a photo of the signed manifest and receipt
- Deodorizer product per truck with its safety data sheet attached, and a block when a site bans formaldehyde or 1,4-dichlorobenzene
- Land application log where used: site, acres, crop nitrogen need, allowed gallons per acre (N / 0.0026, or your state's stricter factor), pathogen and vector method, signed certification, kept five years
- Monthly disposal report by site and by jurisdiction, matched to the plant's bill
Module 8
Damage, tip-over and vandalism incidents
Damage is billable only when the evidence is attached to the unit and the invoice.
- Incident record: unit, rental, type (tip-over, vandalism, fire, theft, overuse, vehicle strike, frozen), found by, photos, GPS, time
- Tip-over response: re-set, pump, clean the ground, restock, with a separate charge line
- Delivery photo compared with incident photo for the dispute
- Status: Reported, Charged, Disputed, Waived, Repaired, Unit retired
- Repeat-incident flag per site (for example three tip-overs in four weeks prompts staking or tethering no more than two units together)
Module 9
Rental billing, proration and winter fees
Rent runs on each unit line's own anniversary, and the year has thirteen 28-day cycles, not twelve months.
- Billing cycle per contract: 28-day anniversary, calendar month or per event
- Weekly billing batch picks up every anniversary that fell that week
- Proration of the first and last partial cycle by day or by week
- Charge lines: rent per unit, extra services, delivery, pickup, damage, winter brine fee, fuel or environmental fee
- Customer-owned units and holding tanks billed per pump instead of per cycle
- Invoices on your template, synced to QuickBooks or Xero, with a card on file option
Module 10
Customer portal, winter mode and reporting
Contractors want proof the units were serviced, and the owner wants to see units on rent, gallons hauled and money owed in one place.
- Portal per customer: units on each site with last service time and photo, invoices, order more units, request extra service or pickup
- Winter mode from November: brine or methanol mix field on every service, mix set weekly from the forecast, frozen-unit reason code
- Technician credentials: PSAI certification date, state licence number and renewal date (for example Illinois renewal by 30 April)
- Reports: units on rent by type, utilisation, revenue per 28-day cycle, missed stops, incidents by site, gallons by disposal site
The AI agents, set up for portable toilet rental companies
| Agent | When | What it does | What you get |
|---|---|---|---|
| Calling agent | An event planner or contractor calls the office number, including after hours | Asks the sizing questions (attendance, hours, alcohol, all-at-once traffic, public event; or peak workers, shifts and service frequency), checks unit availability for the dates, and runs the sizing calculator. | A Sized order with standard, ADA and hand wash counts and a draft quote waiting for approval, plus a call summary. |
| Document intelligence agent | A general contractor emails a purchase order or a subcontract PDF for site services | Reads the PO number, site address, unit counts, service frequency, start date and billing terms, and matches the customer. | An order with rental lines and a 28-day billing start date, with the PO attached and anything missing flagged. |
| Vision agent | A driver uploads a service or exception photo | Checks whether the unit is upright, tagged and intact, and looks for graffiti, burn marks, broken doors or overflow. | An incident record on the unit (tip-over, vandalism, overuse) with the photo, ready for a damage or extra-service charge. |
| Watcher agent | An on-rent unit passes 8 days without a completed service, or a truck load has no manifest photo by end of day | Compares each active rental line's service frequency with its last completed stop, and each discharge with its disposal record. | A missed-service alert to dispatch with the unit and site, and a missing-manifest task for the driver. |
| Dispatch agent | An emergency pump, tip-over reset or extra event cleaning is booked for today | Finds the truck nearest the site that has fresh-water and waste gallons left on its route and a driver with the right licence. | The stop added to that truck's route in the right sequence, with the dump trip moved if needed. |
| Autopilot | A 28-day invoice goes 14 days unpaid, or a contractor's job ends with units still on rent | Drafts the payment reminder with the cycle dates and service photos, or an off-rent check asking whether to schedule pickup. | A drafted email or text that a person approves before it is sent. |
Straight answers
Portable toilet rental: FAQ
What software do portable toilet rental companies use?
Most use route software built for the trade, such as ServiceCore, CRO Software, The Service Program or stopSuite, or enterprise waste platforms like Routeware and AMCS when portables are one line of a larger waste business. The key features are unit tracking by serial number, automatic weekly service routes, 28-day rental billing, a driver app with GPS-stamped photos, and disposal records. Fieldproxy is an option for operators who want the system built around their own process.
How many portable toilets does a construction site need?
OSHA 29 CFR 1926.51 sets the legal minimum: one toilet for 20 or fewer workers, then one seat and one urinal per 40 workers. Most operators quote from ANSI/PSAI Z4.3, which is stricter: one unit per 10 workers for a 40-hour week when serviced weekly, or one unit per 15 to 20 workers when serviced more than once a week.
How many porta potties do I need for an event?
Use the PSAI special event chart: for example 5 units for 500 people over 4 hours, 16 units for 2,000 people over 6 hours, and 100 units for 10,000 people over 8 hours. Add 10-20% if alcohol is served, more if everyone will go at once, and make at least 5% of the units ADA accessible.
How many ADA portable toilets are required?
Under the 2010 ADA Standards, at least 5% of single-user portable units in each cluster, and no fewer than one, must be accessible and carry the International Symbol of Accessibility. Units used only by construction workers on a construction site are exempt.
How often should a portable toilet be serviced?
Weekly is the norm for construction, and ANSI Z4.3's unit counts assume it. PSAI says a 60-gallon tank should be serviced when it holds 20-30 gallons, which is roughly 200-250 uses. Busy sites, events and hot weather need more frequent service or more units.
Why do portable toilet companies bill every 28 days?
A 28-day cycle makes every billing period the same length and gives 13 invoices a year instead of 12. It also makes weekly proration simple. ServiceCore's 2022 benchmark report found 83% of operators use it. Some customers dislike the moving due date, so it belongs in the contract.
Where does portable toilet waste go?
Usually to a permitted septage receiving station at a wastewater treatment plant, with a manifest for each load. Some is land applied under EPA 40 CFR Part 503, which treats portable toilet waste as domestic septage. Nevada divides the land application rate by six for portable toilet fluids because they are stronger in nitrogen.
How many toilets can one service truck do before dumping?
It depends on the fresh-water tank more than the waste tank. A worked example from a PSAI conference session used about 7 gallons of waste and 7 of fresh water per service: a 1,100-gallon waste tank covers about 157 units, but a 400-gallon fresh tank covers only about 57.
How do you keep portable toilets from freezing?
Add brine or methanol to the charge. PolyJohn gives half a pound of rock salt per gallon for protection to 26 F, a saturated brine of about 2.25 lb per gallon to 0 F, and 2 lb salt plus 40 oz methanol per gallon to -40 F. One operator's driver manual says a week without service in cold weather often freezes a unit.
Do portable toilet technicians need a licence?
It depends on the state. Illinois licenses portable sanitation businesses ($250 a year) and certifies technicians ($50 a year). Wisconsin licenses septage businesses but exempts portable restroom servicing assistants from operator certification. PSAI's Basic Service Technician Training plus its exam satisfies Illinois and Georgia licensing.
Related guides
All sources on this page (20)
- source: ANSI/PSAI Z4.3-2016, Portable sanitation at work sites
- source: PSAI Guide to Portable Restroom Excellence (2016)
- source: US Access Board, Guide to the ADA Standards, Chapter 6 toilet rooms
- source: ServiceCore, 28-day billing vs monthly billing
- source: 29 CFR 1926.51, Sanitation (OSHA construction)
- source: 40 CFR 503.17, recordkeeping
- source: 40 CFR 503.32, pathogens and site restrictions
- source: UOSA septage receiving facility registration and rules (2027)
- source: California AB 1824 (2010), chemical toilet additives, H&SC 25210
- source: Ill. Admin. Code tit. 77, 905.200, licenses and fees
- source: PSAI Special Event Chart, extended breakdown
- source: PSAI 2020 CTS session, Choosing the Right Truck for the Job
- source: PolyJohn, Winterization: preparing for the big chill
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