When replacing only the septic tank makes sense
A tank-only replacement fits when an inspection finds the tank itself is failing, such as a cracked, collapsed or leaking tank, while the drainfield still takes water properly. If the drainfield is also failing, or the property is on a cesspool, the job becomes a larger system repair or replacement.
The clearest evidence comes from an inspection, ideally right after the tank has been pumped so the walls and pipes can be seen. Our septic inspections page explains town inspection schedules, and it lists the conditions that count as failure. If the drainfield is the problem, see leach field replacement.
Is it really a tank, or a cesspool?
Some older structures called tanks are legally cesspools. The Cesspool Act defines a cesspool as any buried chamber, other than an onsite treatment system, that collects solids and discharges liquids into the surrounding soil. That includes metal tanks, perforated concrete vaults and covered excavations.
The difference matters. A true septic tank holds wastewater and sends it on to a drainfield. A chamber that leaks by design into the ground is a cesspool, and the state's rules on cesspools apply, including removal within 12 months of a sale (§ 23-19.15-12). If your paperwork is unclear, our do I have a cesspool guide walks through how to tell, and cesspool replacement covers the fix.
Permits and paperwork for a tank replacement
Replacing a septic tank counts as a repair, so it goes through RIDEM. A designer with a valid license prepares the repair application, and for a typical home a Class I license, which covers residential repairs up to 900 gallons per day, is enough under § 6.10 of the OWTS rules.
RIDEM lists typical review times of 1 to 2 weeks for repair applications. After approval, an installer licensed under § 6.14 does the work, and RIDEM inspects the installation. South Kingstown's repair procedure then asks owners to submit RIDEM's Certificate of Conformance to the town. Keep copies of each approval for your records.
Tank-only repairs near the salt ponds
In the Salt Pond and Narrow River critical resource areas, RIDEM normally requires nitrogen-reducing technology for any repair. Section 6.43 of the OWTS rules carves out limited exceptions for repairs that only replace the septic tank, which can keep a simple tank swap from turning into a full advanced system.
The exception is narrow, so have your designer confirm whether it fits your repair before you plan around it. The salt pond area covers parts of Westerly, Charlestown, South Kingstown and Narragansett, and the Narrow River area covers parts of Narragansett, North Kingstown and South Kingstown. RIDEM's boundary lookup tool shows whether your lot is inside. If the exception does not fit, the repair will need a nitrogen-reducing design.
What septic tank replacement costs
We did not find a Rhode Island price list for tank-only work. As a reference, EPA puts the national cost to fix a malfunctioning conventional system at $5,000 to $15,000, and RIDEM's published range for replacing a cesspool with a full conventional system is roughly $10,000 to $15,000.
Tank size, access for equipment, groundwater and the design fee all move the price. RIDEM's ranges are undated, so treat them as a starting point; real quotes depend on your site. Ask for an itemized quote that separates the design, permit and installation costs. Call 401-535-7951 for a free estimate.
This is general information, not legal or tax advice.
Paying for the repair with a septic loan
Most South County towns take part in the Community Septic System Loan Program, which funds repair or replacement of failing systems. RIIB's SFY2026 plan prices homeowner loans at 1 percent a year on the balance plus a $300 origination fee, for up to 10 years.
RIHousing says most programs cap loans at $25,000, and you apply through your town. Narragansett caps loans at $20,000 for failed systems, and Exeter is not listed as participating. Always confirm current terms with your town or RIHousing. Our Rhode Island septic loan guide explains how to apply.
This is general information, not legal or tax advice.
Looking after a new tank
A new tank still needs regular pumping and inspection. EPA's general guide is pumping every three to five years, and some South County towns set their own rules, from North Kingstown's pump-at-50-percent requirement to Block Island's 25 to 33 percent trigger (EPA).
Keep the RIDEM approval and Certificate of Conformance with your house records, since a future buyer or town inspector will ask for them. See septic pumping in South County for town pumping schedules, the Rhode Island cesspool law overview for sale rules, or browse all septic services. You can also contact us to talk through your options.
Septic tank replacement questions
Do I need a permit to replace a septic tank in Rhode Island?
Yes. Replacing a tank is a repair to an onsite system, so a designer with a valid RIDEM license prepares a repair application for RIDEM review. RIDEM lists typical review times of 1 to 2 weeks for repairs. An installer licensed by RIDEM then does the work, and the installation is inspected.
Can I replace just the tank if I live near a salt pond?
Possibly. RIDEM's rules for the Salt Pond and Narrow River critical resource areas require nitrogen-reducing technology for repairs, but they allow limited exceptions for repairs that only replace the septic tank. Your designer can confirm whether your repair qualifies, and RIDEM's online boundary tool shows whether your lot is inside one of these areas.
My house has a steel tank. Is that a cesspool?
It may be. Rhode Island's Cesspool Act counts metal tanks, perforated concrete vaults and covered excavations as cesspools when they collect solids and discharge liquid into the soil. If yours works that way, the cesspool rules apply, including removal within 12 months of a sale. An inspection can confirm what you have.
How much does it cost to replace a septic tank?
We did not find a Rhode Island figure for tank-only work. EPA puts the national cost to fix a malfunctioning conventional system at $5,000 to $15,000, and RIDEM's range for a full conventional replacement is roughly $10,000 to $15,000. Your quote depends on tank size, access and site conditions.
Can I get a loan to replace my septic tank?
In most South County towns, yes, through the Community Septic System Loan Program, which covers repair or replacement of failing systems. RIIB's SFY2026 plan lists 1 percent a year plus a $300 fee for up to 10 years, and most towns cap loans at $25,000. Exeter is not listed as participating.