Switching From a Private Well to City Water: Fees, Permits and the Old Well

Switching an existing home from a well to city water costs the utility’s connection charges, a plumber to run the line from the meter to the house, and either a backflow device or the cost of sealing the well. The utility part varies widely. Unincorporated Hillsborough County, Florida, lists $2,592.50 to $4,004 in set fees for a well conversion with a 5/8-inch meter, depending on the service area. Port St. Lucie charges $7,256 or $8,036 for water, including a $941 well retrofit charge. In Cape Coral’s utility extension areas, the water assessment alone is $7,246 per 10,000 square feet of land in the North 1 West project.

Our well vs city water comparison covers whether switching pays off over 20 years. This one covers the switch itself: fees, plumbing rules, the old well, and when you have no choice.

What utilities charge an existing well home

Converting homes generally pay the same capacity, meter, setup and deposit charges as new construction; Port St. Lucie adds a conversion charge.

Published charges for converting an existing single-family home from a well to city water, 5/8-inch meter. Figures read September 2026.

Three details change these numbers.

• Hillsborough’s capacity fees are rising. Under the county’s impact fee schedule, the South/Central water fee rises to $4,684 on March 23, 2027, and the North (Northwest) area fee to $2,212. The county’s deposit can be waived with an approved credit check, and it wants all fees paid before it sets the meter, typically 10 to 14 business days later.
• Port St. Lucie’s fee is new construction plus a retrofit charge. The city’s fee schedule adds a $941 residential well conversion retrofit charge to the $1,320 meter installation fee. The arithmetic holds: the city’s water-only new-construction charge outside the USA/SAD areas is $7,095, and $7,095 + $941 = $8,036. The city will also spread it over 10 years with no interest: $115.50 at application ($70 deposit + $45.50 recording fee), then 120 payments of $66.38. Check: $70 + 120 × $66.38 = $8,035.60, the fee within rounding; the $45.50 recording fee is on top.
• Cape Coral’s assessment scales with land. The water assessment is per 10,000-square-foot equivalent parcel, so a 15,000-square-foot lot pays 1.5 times as much. Sewer and irrigation assessments come with it; see our septic conversion article.

None of these totals includes the private side. Hillsborough lists the connection from the meter to the home, well abandonment and permits as variable costs you arrange with a licensed plumber. Our national estimate for a water service line is $30 to $150 per foot, typical $50 (benchmarks); the water service line guide explains what moves that number.

Worked example: a South/Central Hillsborough home

A house 60 feet from where the county will set the meter, choosing to seal the well:

• County set fees: $3,449 + $350 + $25 + $90 + $90 = $4,004
• Service line, national estimate at the typical rate: 60 ft × $50 = $3,000
• Well sealing, national estimate, typical: $1,000 (range $300 to $1,500)
• Total: $4,004 + $3,000 + $1,000 = $8,004, before the plumbing permit

Keep the well for irrigation instead and the $1,000 drops out, but the plumber must fully separate the well piping from the house, and the utility may require more backflow protection than the $90 dual check. Paid after March 23, 2027, the capacity fee alone would be $4,684, adding $1,235.

Why the well has to come off the house plumbing

The general rule: once a home takes public water, the well should not feed the same plumbing. A pipe or valve that lets well water reach the public side is a cross-connection, and state drinking water rules put the burden on the utility to stop it.

• Florida. Rule 62-555.360 of the Florida Administrative Code treats a well on the property as an auxiliary water system. For a home with a service of 2 inches or less, a dual check device at the service connection is enough only if there is no known cross-connection between the house plumbing and the well. If one is found, the utility must have it eliminated or require the stronger protection used for non-residential connections. Hillsborough, for example, charges a $90 residential dual check fee to converting well owners and warns that the county plumbing inspector may require more.
• Washington. WAC 246-290-490 lists premises with an unapproved auxiliary water supply interconnected with the potable supply as high-hazard. They need an air gap or a reduced-pressure backflow assembly at the service connection.
• Texas. 30 TAC 290.46 bars any physical connection between a public water system and another water supply unless the other supply is safe and the state approves the interconnection. It also requires a customer service inspection when the utility suspects a cross-connection, and a health hazard is grounds for cutting off service.

Backflow hardware has a price. Port St. Lucie charges $394 to install a domestic backflow assembly on a 5/8-inch meter, plus $85 per test and certification, where one is required. OUC in Orlando prices a standard 5/8-inch service at $4,155, or $4,600 with a backflow device, under its January 2026 tariff, a $445 difference.

Keeping the well for irrigation

Many utilities allow it, as long as the well serves only outdoor taps and sprinklers on piping that never touches the house system. Hillsborough tells converting owners they must decide whether to abandon the well or keep it. DeWitt, Iowa, which requires homes to use city water, expressly lets existing wells keep watering lawns and landscaping for as long as the owner wants. Cape Coral says wells can stay in place in its extension areas, but whether they may be used for irrigation depends on the project.

A kept well is still yours to maintain. In Texas, a well that is not deteriorated and benefits the landowner may be capped rather than plugged, with a cover that can bear 400 pounds and cannot easily be removed by hand, under 16 TAC 76.104. If the well later fails or falls out of use, the abandonment rules below apply.

Plugging the old well: state rules and fees

Well abandonment rules in four states, read in the primary text September 2026.

The Florida permit detail comes from the Southwest Florida Water Management District’s consumer guide to well construction, which covers Hillsborough County; Florida’s other water management districts run their own well permit programs, so check the district for your county. In Hillsborough, the county also points owners to Health Department and Environmental Protection Commission requirements. Colorado adds that the owner carries the ultimate responsibility for plugging.

The state fee is small; the contractor is the real cost. Our national estimate for sealing a residential well when connecting to public water is $300 to $1,500, typical $1,000, and deep or large-diameter wells can run higher (benchmarks). Drilling and permit costs for new wells are in well permit cost by state.

When connection is mandatory

There is no national rule. The local rules we verified in primary text:

• Cape Coral, Florida: homes in a utility extension project must connect to water and sewer within 180 days of the city’s Notice of Availability.
• DeWitt, Iowa: homes must use city water. A well not allowed to continue must stop and be plugged 90 days after city water reaches within 300 feet of the property, and new wells are allowed only where city water is farther than 300 feet away.
• Marion County, Florida: under Ordinance 19-13 (adopted July 16, 2019), an existing home within 400 feet of a water line with capacity must connect when its well stops working or it needs a new well, rather than on the day the main arrives.

Local codes change, so confirm the current text with the county or city. Under a Marion County-style rule, a failed well pump is the moment to call the utility. Sewer rules are usually stricter; see mandatory sewer connection distance.

Step by step

1. Get the utility’s charges in writing and confirm a main abuts your lot.
2. Decide whether to seal the well or keep it for irrigation on separate piping.
3. Get quotes: plumber for the service line, disconnection and any backflow device; licensed well contractor for sealing.
4. Pull the plumbing permit, pay the fees, schedule the meter, then file your state’s well abandonment paperwork.

For the full cost picture, run the utility connection cost calculator, and check the Hillsborough County, Port St. Lucie and Cape Coral fee pages or the Florida hub.

Frequently asked questions