What is a 28-day porta potty billing cycle?
A 28-day porta potty billing cycle is a rental period that is exactly 4 weeks long. David Rental Works bills long-term units every 28 days from the delivery date until you call for pickup. Each 28-day cycle includes 4 weekly service visits on the same weekday: pump, clean and restock.
Calendar months run 28 to 31 days. That makes the number of service visits change from month to month. A 28-day cycle always holds exactly 4 visits, so your price and your service day stay the same.
- Billing starts on the delivery date, not the 1st of the month.
- Weekly service is included in every cycle.
- No contract and no minimum beyond 1 cycle.
- Billing stops on the pickup date we confirm.
Why are there 13 porta potty billing cycles in a year instead of 12?
A year has 13 porta potty billing cycles because 365 days ÷ 28 days = 13.04. Thirteen 28-day cycles cover 364 days, while 12 calendar months cover 365. That 13th cycle is why a yearly total looks higher than 12 times the cycle price, even though the daily rate is the same.
| Measure | 28-day cycle | Calendar month |
|---|---|---|
| Length | 28 days, always | 28–31 days (average 30.4) |
| Periods in a year | 13 (13 × 28 = 364 days) | 12 (365 days) |
| Weekly service visits per period | Exactly 4 | 4 or 5, varies |
| Service weekday | Same every week | Same, but visit count shifts |
| Start date | Your delivery date | Often the 1st of the month |
The quick math: divide your cycle price by 28 to get the daily rate. Multiply by 13 for a full year. A monthly quote from another company, multiplied by 12, covers the same year. Compare those two yearly totals, not the per-period price.
Want a yearly total for your site?
Tell us the start date and crew size. We quote per cycle and per year so you can compare.
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What do 28-day porta potty billing dates look like?
Porta potty billing dates follow the delivery date. A unit delivered Tuesday, October 6, 2026 bills cycle 1 for October 6–November 2, cycle 2 for November 3–30, cycle 3 for December 1–28 and cycle 4 for December 29–January 25. Each new cycle starts on a Tuesday, the same weekday as delivery.
| Cycle | Dates (delivered Oct 6, 2026) | Weekly services |
|---|---|---|
| 1 | Oct 6 – Nov 2, 2026 | 4 (plus delivery and setup) |
| 2 | Nov 3 – Nov 30, 2026 | 4 |
| 3 | Dec 1 – Dec 28, 2026 | 4 |
| 4 | Dec 29, 2026 – Jan 25, 2027 | 4 |
Because cycles do not line up with months, some calendar months will show 2 billing dates. Your invoice always shows the cycle dates it covers.
What does the first 28-day porta potty cycle include?
The first 28-day porta potty cycle includes the unit, 4 weekly services and a one-time delivery and pickup charge. That one charge covers both truck trips, so there is no separate removal fee at the end. There is no fuel surcharge either. You pay the first cycle by card at booking.
| Quote line | Cycle 1 | Cycles 2+ |
|---|---|---|
| Unit rental (28 days) | Yes | Yes |
| Weekly pump, clean, restock (4 visits) | Yes | Yes |
| One-time delivery and pickup | Yes | No |
| Extra service visits (2x/week) | If ordered | If ordered |
| Sales tax | Yes | Yes |
Crews with more than about 10 workers per unit usually need 2 services a week. See long-term porta potty rental servicing for schedules.
How do I stop porta potty billing?
Porta potty billing stops on the pickup date David Rental Works confirms. Call (562) 603-5505 by 2 p.m. to schedule a pickup. There is no contract and no minimum beyond 1 cycle, so you can end the rental any time after the first 28 days start. Billing does not stop until you call.
- Call by 2 p.m. Monday–Saturday with your site address.
- We confirm a pickup date and read it back to you.
- Billing stops on that confirmed date.
- Clear the path so the driver can reach the unit.
- The final invoice shows the last cycle dates.
Is a 3-day job billed a full 28-day porta potty cycle?
Yes, a 3-day job on a construction rate is billed 1 full 28-day porta potty cycle. That is usually the wrong rate for a short job. Event pricing covers up to 3 days on site and is usually cheaper for anything under 1 week, so David Rental Works quotes whichever option is lower.
| Job length | Usually cheaper | Why |
|---|---|---|
| 1–3 days | Event / short-term rate | Covers up to 3 days with delivery and pickup |
| 4–6 days | Ask for both quotes | Depends on servicing needs |
| 1–4 weeks | 28-day cycle | Weekly service included |
| 1 month+ | 28-day cycles | No contract, stop any time after cycle 1 |
More on short jobs: short-term porta potty rentals.
Can I pay for a porta potty quarterly or by invoice?
David Rental Works bills porta potties per 28-day cycle, and one calendar quarter of 91 days equals 3.25 cycles. The first cycle is paid by card at booking. Contractors can apply for net-30 invoicing, which takes about 2 business days to approve. Ask on the call if your office needs a different billing setup.
We take Visa, Mastercard, Amex, Discover and debit. A certificate of insurance can be emailed the same day. Accounts payable teams can get itemized quotes by email for approval.
Set up a long-term jobsite account
Ask about net-30 invoicing and a COI on the same call.
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Questions customers ask before booking
Real questions from our customer calls, answered by our dispatch team.
Even if I take it for 3 days, are you charging me for the full month?
On a construction rate, yes, 1 full 28-day cycle. That is why we quote the event rate too. A standard event unit starts at $175 for up to 3 days on site with delivery and pickup. Typical starting price as of October 2026; your itemized quote is final.
How much is a long-term porta potty per cycle?
A standard unit starts at $165 per 28 days with weekly service, plus $60 one-time delivery and pickup. Typical starting price as of October 2026; your itemized quote is final.
What if I keep it 28 days?
28 days is exactly 1 cycle. On day 29 the second cycle starts unless pickup is confirmed for day 28 or earlier.
Is servicing automatic or do I schedule it?
Automatic. Weekly service is booked on a set weekday when the unit is delivered. You only call to add visits or change the day.
Can I pay quarterly?
We bill per 28-day cycle. Contractors can apply for net-30 invoicing. Call us and tell us how your accounts payable works.
Is there a removal fee at the end?
No. Pickup is part of the one-time delivery and pickup charge on the first cycle. There is no fuel surcharge.