What General Liability Costs
for Septic Contractors.
Priced per thousand dollars of payroll, against a class code, settled at audit. Here is the structure, and the one bookkeeping habit that moves it most.
We shop your septic business with carriers like
What determines your number
Four inputs, three of which you can influence.
Your classification
Which septic class your operations fall in, and whether cleaning and installation are split correctly.
Your payroll
Per $1,000, including commissions, bonuses, overtime and tool allowances, plus a third of hired-equipment-with-operator costs.
Your subcontracted work
Rated separately on total cost where you sublet.
Your limits and your losses
Limits selected, and claims history, which is the part that takes years to improve and minutes to damage.
The Septic Cleaning Insurance Group Policy Review
We read the whole policy
Before we quote anything we read what you already have, cover to cover, and tell you plainly what it does and does not do.
We map your actual operation
Pumping, installation, hauling, grease trap, portable units: each one underwrites differently. We classify what you really do, not a generic contractor code.
We shop carriers who understand septic risk
Standard markets when they fit, specialty and E&S markets when they do not. If a carrier does not understand pollution exposure, we do not use them.
We explain the quote in plain language
You get the number, the limits, the exclusions that matter, and the reasoning. No pass-through, no blind binding.
Where we actually find money on this line
Payroll split by operation
The highest-rated-class default is the most expensive bookkeeping habit in this trade, and the cheapest to fix.
Classification checked against the real work
Cleaning and installation are different classes. Being written entirely as one is common and costly.
A realistic estimate at bind
So the audit is a formality rather than an event.
Exclusions read before price is compared
A cheaper GL that carries a total pollution exclusion is not cheaper, it is less.
Your general liability is priced off payroll, not revenue
Most septic owners assume GL is rated on what the business brings in. For contracting work it is not, and knowing which number drives it changes what you do about it.
What the rating manual actually says
The industry classification manual states plainly: “Contracting and servicing risks are rated on a ‘payroll’ basis.” The rate is applied per $1,000 of payroll. Insurance industry reference IRMI describes the same structure: contracting and services premium is developed “by applying the rate to payroll.”
Every classification carries a premium base symbol
Filed manuals mark each class with a single letter: a for area, c for total cost, m for admissions, o for total operating expenses, p for payroll, s for gross sales, u for units. Septic work is p.
There are real septic classifications, and both are payroll
The classification table lists Septic Tank Systems – cleaning and Septic Tank Systems – installation, servicing as separate classes, both with premium base p. Sewer Cleaning and Sewer Mains or Connections Construction are separate again, also payroll-based.
Work you sublet is the exception, and it is rated on cost
The subcontracted-work classifications carry base c, Total Cost, defined as “the total cost of all work let or sublet in connection with each specific project including… all labor, materials and equipment furnished… and all fees, bonuses or commissions.” If you sublet a lot, that is a second exposure sitting alongside your payroll.
Payroll means more than wages
The manual counts commissions, bonuses, overtime, holiday and sick pay, and tool allowances. It also has a rule for hired equipment with operators: where the operators come with the machine and their actual payroll is not known, one third of what you paid to hire the equipment is counted as payroll.
Sources: IRMI, The ISO Classification System and the CGL Policy
Keep separate payroll records, or get charged at the highest rate
- The manual directs you to “divide the payroll for each distinct type of operation as classified at a job or location”
- A septic business doing cleaning and installation has payroll in more than one class, each with its own rate
- Separate records let each portion be rated at its own, correct rate
- Territory is set by headquarters, except where a job is in another state, in which case the territory generating the highest payroll in that state applies
- “Any such operation for which separate payroll records are not maintained shall be assigned to the highest rated classification applicable to the job or location”
- That is not a penalty clause buried somewhere. It is the default
- A crew that does both and books hours as one lump gets priced entirely at the dearer rate
- This is the single cheapest thing to fix on most septic accounts, and it is a bookkeeping change rather than an insurance one
What you pay up front is a deposit
This is why a cheap quote can become an expensive year, and why an honest estimate at bind is worth more than a low one.
Your policy says so in its own conditions
A standard general liability policy provides that the “premium shown in this Coverage Part as advance premium is a deposit premium only. At the close of each audit period we will compute the earned premium for that period and send notice to the first Named Insured.”
It cuts both ways
The same condition continues: “If the sum of the advance and audit premiums paid for the policy period is greater than the earned premium, we will return the excess.” Come in under your estimate and money comes back. Go over it and you owe the difference.
You are contractually required to keep the records
“The first Named Insured must keep records of the information we need for premium computation, and send us copies at such times as we may request.” The audit is not optional and neither is the paperwork.
Which makes the low-estimate quote a trap
Understating payroll produces a cheaper number on day one and an audit bill at the end. It does not save money, it moves it, and it moves it to a moment when you have not budgeted for it.
Sources: IRMI, Premium Audit, Travelers CGL policy filed with the Kentucky PSC
Base, times rate, divided by a thousand
Here is an actual premium line from a general liability policy filed in a public utility docket, with the class, the base, the exposure and the rate all visible.
One line item, fully itemised
A filed declarations premium schedule shows the columns class code, premium base / exposure, rates, and advance premium. One line reads: class 92445, premium base P, exposure $428,208, rate 75.544, advance premium $32,349.
Check it yourself
428.208 thousands of payroll, multiplied by a rate of 75.544 per thousand, is 32,349. The arithmetic is not mysterious, and once you know your class and your rate you can do it on the back of an envelope.
Minimum premiums exist
The same schedule shows minimum premiums applied per coverage, so a very small operation does not simply scale to nothing. There is a floor.
And this is why classification matters more than shopping
Change the rate, and every future year changes with it. Change the carrier while keeping the wrong class, and you have bought the same mistake from somebody else.
One carrier publishes its own averages
We do not quote industry averages, because no credible septic-specific one exists. One carrier does publish figures from its own book, and it is worth reading them for exactly what they are.
- Progressive Commercial reports that in 2025 the average cost of general liability for its new customers was $79 per month, with a median of $55 per month
- That is one carrier’s own new-business book, across all small business classes
- The factors they list are profession, type of work, location, number of employees, time in business, coverage limits and claims history
- Useful as a sanity check on order of magnitude for a very small operation
- It is not a septic figure. There is no septic category in it
- Notably, that published factor list does not mention payroll, revenue or class code, because small-business GL is frequently sold on a simplified rating plan rather than the full classification manual
- So do not use that number to reason about how a classified, payroll-rated contractor policy will price
- And do not expect a crewed septic operation with pollution exposure to land anywhere near a median small-business figure
Underwriters who’ve actually walked a septic job site
Septic Cleaning Insurance Group
We built this agency around one gap we kept seeing: big-box commercial insurers write septic contractor policies the same way they write policies for any other trade, missing the environmental and pollution exposure that actually matters in this business. Our team goes deep on septic-specific risk before recommending coverage, maintains relationships with carriers who understand pumping, installation, and disposal operations specifically, and keeps specialty and E&S markets in reserve for the accounts standard carriers will not touch.
Straight answers, no insurance-speak
Not for contracting work. The classification manual states that contracting and servicing risks are rated on a payroll basis, with the rate applied per $1,000 of payroll. Gross sales is the basis for manufacturing and mercantile classes, not for a septic contractor.
Yes, and unlike workers compensation this one is reasonably clean. The classification table carries separate classes for septic tank systems cleaning and for septic tank systems installation and servicing, both rated on payroll. Sewer cleaning and sewer mains construction are separate classes again.
It matters a lot, and the rule is unforgiving. The manual says to divide payroll by each distinct type of operation, and that any operation for which separate payroll records are not maintained is assigned to the highest rated classification at that job or location. If your books lump the crew’s hours together, you get charged at the dearer rate for all of it.
That is the exception to the payroll rule. Subcontracted-work classifications are rated on Total Cost, defined as the cost of all work let or sublet on a project including labour, materials, equipment, fees, bonuses and commissions. If you sublet a lot, it is a second exposure sitting beside your payroll.
Often yes. The manual provides that where operators come with equipment you hire and their actual payroll is not known, one third of the total amount you paid to hire the equipment is counted as payroll. Renting a machine with a driver is not a way around the payroll basis.
Because the premium on your declarations is a deposit. Your policy states that the advance premium is a deposit premium only and that earned premium is computed at the close of the audit period. If your actual payroll exceeded the estimate, the difference is billed. If it came in under, the excess is returned to you.
You can, and we will not do it for you. It produces a lower number on day one and an audit bill later, at a moment you have not budgeted for. We would rather set a realistic estimate and have you keep the refund if you come in under.
Separate your payroll records by operation so each portion is rated at its own class rate rather than all of it defaulting to the highest. That is a bookkeeping change, it is free, and it compounds every year. After that it is claims history and limits.
Get Your General Liability Cost Septic Insurance Quote
A few quick questions about your operation. Takes about 2 minutes. Prefer to talk first? Call (855) 461-2010.
Is your payroll split by operation?
If it is not, you are probably being rated at your highest class for all of it. Send us your declarations and we will tell you.
No pressure. If we’re not the right fit for your business, we’ll tell you straight.
Septic contractor insurance in your state
Rates and territory assignment differ by state. Pick yours.