Septic to Sewer Conversion in Port St. Lucie Florida

Port St. Lucie lists $9,445 paid in full, or $77.79 a month for 120 months interest free, to move an existing septic system to city sewer in a Special Assessment District, effective Oct. 1, 2026 (Septic to Sewer Conversion Program).

The same page says connection costs outside those districts may vary, and that the application also carries a $110 sewer deposit and a $45.50 document recording fee (program page). The Port St. Lucie Water and Sewer Conversion sheet, which carries no printed date, lists the wastewater only (low pressure) conversion at $9,445 paid in full in USA/SAD areas and $11,417 in non-USA/SAD areas, for a 5/8 by 3/4 inch meter, the only size the sheet covers (Water and Sewer Conversion sheet).

Two Port St. Lucie figures for the same monthly payment differ. For a Special Assessment District conversion, the program page gives $77.79 a month (program page), while the conversion sheet lists $78.71 for USA/SAD areas (conversion sheet). The earlier dated column is from the Port St. Lucie residential customer service guide, whose conversion schedule cites Ordinance 25-51, approved September 22, 2025, effective October 1, 2025 (Utility Systems customer service guide).

Owners leaving both a well and a septic tank pay the combined water and wastewater charge. The conversion sheet lists it at $16,780 paid in full in USA/SAD areas and $19,532 elsewhere, with $225.50 due at application (conversion sheet). The Port St. Lucie water and sewer rates guide covers the monthly service charges that follow a connection.

The City of Port St. Lucie Special Assessment and Property Tax division posts a Water and Sewer Special Assessment District Map alongside its developer district map (Special Assessment and Property Tax page).

That division oversees the city's annual non-ad valorem billing, including city water and sewer and developer special assessment districts, and takes questions at financeassessment@cityofpsl.com (Special Assessment and Property Tax page). Its FAQ says a special assessment placed on the tax roll is assessed annually and billed to the property for the period set for that assessment, that special assessments are billed from Nov. 1 through Oct. 31, and that a Special Assessments Summary shows the last year of each billing (same FAQ).

The district question matters because the Port St. Lucie conversion sheet prices the same work in two columns, USA/SAD areas and non-USA/SAD areas (conversion sheet), and because the program page quotes only the district price (program page). For grant eligibility the sheet names City Hall's Connection Support Office, 772-873-6400 (conversion sheet).

Port St. Lucie lists six steps, from an appointment with the Connection Support Office to new sod, and says the whole process takes 4 to 6 weeks from application to finished installation (program page).

1. Schedule an appointment, or ask for the paperwork by mail, through the Connection Support Office in City Hall at 772-873-6400 or utility@cityofpsl.com.
2. A pre-inspection of the site.
3. The homeowner meets a contracted electrician, who installs a grinder control box.
4. A sewer crew runs a sewer service line.
5. The crew abandons the old septic tank and installs the new sewer system.
6. The city restores the yard and other disturbed areas with new sod.

The steps above follow the Port St. Lucie program page, which adds that every property owner signature must be notarized for anyone choosing the interest-free 10-year payback (program page). The city supplies all materials and labor to connect the home plumbing to the sewer pump and then to the pipe network in the street, and the connection fee also reserves capacity at the city wastewater treatment plants for that home (program page).

An application does not stay open forever. Port St. Lucie Ordinance 26-86 says a single-family well or septic conversion application is open and active for 12 months after the city accepts and approves it; if the connection is not completed and in service within that time through no fault of the city, the application expires and a new one is required at the rates then in effect (Ordinance 26-86).

Port St. Lucie sources differ: the program page says the city is no longer accepting grant applications, while the city's conversion sheet describes grants of up to 50% of the connection cost (program page).

On the program page, a section headed Grant Applications Closed says grants were available with limited funding and awarded first come, first served, and that the city is no longer accepting applications (program page). The conversion sheet says that in some cases an applicant household can be granted as much as 50 percent of the connection cost, that funding is limited and handed out first come, first served, and that eligibility is checked by calling City Hall's Connection Support Office, 772-873-6400 (conversion sheet).

An earlier dated document, the Port St. Lucie customer service guide with the schedule effective October 1, 2025, describes a further tier: a grant covering 100% of the cost of converting from a septic tank to city sewer for households that income qualify under State guidelines, with up to 50% for some that do not, and a possible loan payoff for owners already on the interest-free plan who fall within a low to moderate income level (customer service guide).

On Port St. Lucie financing, the program page says connection fees can be financed over 10 years with no interest and no financial qualifications required (program page), and the conversion sheet offers 10-year interest-free financing for all or a portion of the cost to owners who do not qualify for a partial grant (conversion sheet). The pay a water bill guide covers the monthly Port St. Lucie utility invoice.

A converted Port St. Lucie home gets a buried collection tank and sewer pump plus a control panel on the side of the house, and the pump sends wastewater into the city's low-pressure sewer line when the tank fills (program page).

The program page sizes the collection tank at 200 gallons (program page), while the city's customer service guide describes the low-pressure wastewater disposal system as a 250-gallon tank, pump and float system (customer service guide). The guide adds that Utility Systems maintains the system from the rear of the tank to the treatment plant at no cost to the homeowner, while the property owner is responsible for any issues with the house plumbing (customer service guide).

When something goes wrong, an alarm sounds and a red light comes on at the Port St. Lucie control panel. The city asks residents to report it at once to 772-873-6400, where a Connection Support Specialist is available 24 hours a day, 365 days a year, and to hold off on laundry, dishwashers and long showers until a technician finishes (program page). After a power outage the alarm often sounds when power returns; the page says to silence it with the red button and call if the light is still on after 30 minutes (program page).

Under section 381.00655, Florida Statutes, a Port St. Lucie owner of a properly working septic system must connect to an available public sewer within 365 days after written notice that the sewer is available (section 381.00655).

For a Port St. Lucie lot, the statute also requires the sewer owner to give at least one year of advance notice of anticipated availability, and lets the owner prepay the amortized connection charges in equal monthly installments over no more than 2 years from that first notice (section 381.00655). A system that needs repair or modification to work in a sanitary manner must connect within 90 days after written notice from the state department, with one hardship extension of no more than 90 days (section 381.00655).

Port St. Lucie applies its own rule to new building. The city says its sewer expansion plan required newly built homes and businesses to connect to city sewer, and that existing septic systems are converted when they fail or when an owner chooses to connect (Water Quality Initiatives page).

The program page says more than 11,000 Port St. Lucie residents have connected from septic to sewer since 1999, averaging 350 conversions a year (program page).

The city's history page says a development group incorporated the city in 1961 with a goal of selling quarter-acre lots to retirees, and that Port St. Lucie started out without key infrastructure, water and sewer among it (city history page). The city acquired its utility assets in 1994, when it served just over 10,000 wastewater customers, and its Water Quality Initiatives page says sewer customers have since grown to over 75,700 (Water Quality Initiatives page).

That page counts the program's results in its own terms: nearly 32,700 septic tanks never installed because of new construction requirements, over 10,300 aging or failing tanks taken out of service, and more than 20 billion gallons of wastewater diverted to the treatment plants by the new grinder pump installations (Water Quality Initiatives page). It also reports that more than 13,580 septic systems remain in service within the Port St. Lucie utility service area, and that monitoring their locations, particularly those within 50 feet of a waterway, prompted a 2017 analysis by the utility (same page). The city names the North Fork of the St. Lucie River and the Indian River Lagoon as the waterways the program protects (program page).

Last verified: October 22, 2026, for Port St. Lucie septic conversions: the city's program and Water Quality Initiatives pages, the Water and Sewer Conversion sheet, the utility customer guide, Ordinance 26-86, the special assessment FAQ, the city history page and section 381.00655, Florida Statutes.