I/A septic system maintenance on Cape Cod

Free to homeowners
Pumping, backups, Title 5 & repair
Providers must hold the required town permit

What Barnstable County and MassDEP require of innovative/alternative (I/A) system owners, how to check your system's records online, and what upkeep costs.

Call (508) 593-9460 Get free help request

Sewage backing up or septic alarm sounding? Stop using water and stay out of any sewage. For a sewage backup, call instead of using the form: (508) 593-9460.

Cutaway of a Cape Cod house: water drains to an underground septic tank, then out to a leach field where it filters through sand.

Harwich Septic Help is a free referral service. We are not a septic company and do not pump, inspect, or repair systems. When you call or send a request, we work on matching you with an independent local septic provider, who must hold the required town permit and may pay us a referral fee. Prices, licensing, scheduling and work are between you and that provider. Call-recording notice: Calls to our number may be recorded to route your request and for quality. A recorded greeting tells every caller this before the call is connected.

What is an I/A septic system?

An Innovative/Alternative (I/A) system is a septic system with extra treatment, usually to remove nitrogen before wastewater reaches the groundwater that feeds Cape Cod's ponds and bays. Barnstable County describes it as a small version of a wastewater treatment plant, with pumps, switches, filters and relays. That's why, unlike a standard Title 5 system, an I/A needs regular maintenance and effluent testing.

On the Cape you may have one because your Board of Health required it, because of the 2023 nitrogen rules, or as part of a repair.

Sources: Barnstable County Septic Management Program; Barnstable County I/A tracking.

I/A alarm going off?

Cut back on water use and call your O&M provider. See what to do when a septic alarm goes off. Sewage in the house? Emergency steps.

Call (508) 593-9460

The rules: an O&M contract at all times

According to Barnstable County, every I/A system must have an operation and maintenance (O&M) contract in place at all times, covering one year of maintenance and testing. Requirements come from two levels:

1. MassDEP baseline (by approval level)

General approval: annual inspection with field tests (dissolved oxygen, turbidity, pH, color).
Remedial approval: inspection twice a year with the same field tests.
Provisional approval: quarterly inspections and lab tests, including total nitrogen.
Pilot approval: monthly inspections and lab tests for three months, then quarterly.

2. Your Board of Health

The Board of Health can add testing parameters and visits. Barnstable County says Boards most often require quarterly inspection and sampling, and some require twice a year. These are general guidelines; your MassDEP approval letter and Board of Health permit say what applies to your system.

After several years of frequent monitoring, owners can typically petition to reduce the frequency (Board of Health for local add-ons; MassDEP too if going below its baseline).

Source: Barnstable County: I/A O&M contract requirements.

Track your system online

Barnstable County runs a database that provides I/A compliance monitoring for fourteen Barnstable County towns. System operators (state-licensed wastewater treatment operators hired by homeowners) submit maintenance and sampling reports to it, and the county flags poorly performing systems.

Homeowners can register to see whether their O&M contract is current, what the Board of Health requires, inspection and sample reports, nitrogen performance, and email or text alerts (for example, if a contract is canceled). For access help the county lists iacompliance@capecod.gov and 774-330-3019.

County O&M service option

Barnstable County's Septic Utility Program offers full O&M (inspections, sampling, routine service calls, pump-outs every 3 to 5 years, minor parts) for one annual fee, a limited pay-per-visit sampling and inspection option, and a low-fee oversight service that tracks contracts and missed inspections. Ask the county whether it serves your town.

Sources: Barnstable County I/A tracking; Septic Utility Program.

What does it cost?

No set price. One vendor's figures in a Town of Falmouth presentation (10/7/2026): $1,400 in year 1, $1,200 in year 2, then $1,000/yr. Get the contract terms in writing, and ask whether pumping and lab fees are included.

Replacing a system? See septic replacement cost on Cape Cod.

Day-to-day I/A care

Keep the power on to the system. If you close a seasonal home, ask your O&M provider before switching anything off (see winter septic care).
Don't ignore the alarm; it usually means a pump or float problem or high water in a tank.
The tank still needs pumping. EPA says systems with mechanical parts should generally be inspected once a year, and tanks are typically pumped every three to five years.
Selling? Buyers and their inspectors will want the O&M contract and reports; see the Harwich seller's guide.

Source: US EPA: How to Care for Your Septic System. The first two points are general guidance, not regulation.

How Harwich Septic Help works

Tell us what is going on. Use the short form: your town, the problem, and how urgent it is. It takes about a minute.
We work on matching your request with one independent provider who serves your town and must hold that town's permit. In Harwich, septage haulers need a Board of Health permit and Title 5 inspectors must be on the town's approved list, so ask the provider to confirm they are on the current list.
The provider contacts you directly, quotes the job and does the work. Price, scheduling and the work are between you and the provider. The referral is free to you; the provider may pay us a fee.

We are not a septic company, inspector or installer, we do not have an office you can visit, and we do not publish reviews or prices we cannot verify.

Request a call back from a local septic provider

Tell us your town and what is going on. We work on matching your request with an independent septic provider serving your area, who must hold the required town permit and contacts you directly. There is no charge to you for the referral.

Call-recording notice: Calls to our number may be recorded to route your request and for quality. A recorded greeting tells every caller this before the call is connected.

For a sewage backup, call instead of using the form: (508) 593-9460.

Frequently asked questions

Does an I/A septic system need a maintenance contract?

Yes. Barnstable County says all I/A systems are required to have an operation and maintenance (O&M) contract in place at all times, and each contract must cover one year of maintenance and testing.

How often does an I/A system have to be inspected?

It depends on the system's MassDEP approval level and your Board of Health. Barnstable County's guide lists, as general guidelines: General approval, an annual inspection with field tests; Remedial, twice a year; Provisional, quarterly inspections with lab tests including total nitrogen; Pilot, monthly for three months and then quarterly. Boards of Health can add more, and most often require quarterly inspection and sampling. Check your MassDEP approval letter.

Can I see my I/A system's inspection reports online?

Yes, if your system is in Barnstable County's tracking database. The county's Septic Management Program lets homeowners register to see their O&M contract status, their Board of Health requirements, and inspection and sample reports, and to get alerts. The county lists iacompliance@capecod.gov and 774-330-3019 for access help.

How much does I/A maintenance cost per year?

There's no set price. In a Town of Falmouth task force presentation (Oct. 7, 2026), one vendor listed $1,400 in year 1, $1,200 in year 2 and $1,000 a year after that for its system. Barnstable County also runs a Septic Utility Program with full and limited O&M service options.

Can I reduce how often my I/A system is sampled?

Sometimes. Barnstable County says approvals typically let owners petition for less frequent maintenance and sampling after a number of years of frequent monitoring: to the Board of Health for local add-ons, and to both MassDEP and the Board of Health to go below MassDEP's baseline.

Sources

Facts on this page come from these official and public sources. Rules change; confirm with your local Board of Health.