Backflow preventer repair and replacement cost

Full replacement prices by device type

These are installed prices, printed by the business or utility that charges them. A utility price means the utility itself puts the assembly in (Fallbrook does it with a new meter); a business price is what a contractor charges to swap a failed assembly. Ranges below run from the lowest to the highest published price, with the number of sources behind them.

Reduced pressure (RP), 3/4 or 1 inch: $699 to $1,046 (3 sources).

Double check (DC), 3/4 or 1 inch: $599 to $1,179 (2 sources).

Pressure vacuum breaker (PVB): only one published price, $499 (Affordable Backflow Testing, Winter Garden, FL). One price is too thin for a range, so none is shown.

Prices printed without a clear device type ($650 to $1,600, 1 source) are in the table as printed and are left out of the type ranges.

Larger assemblies (1 1/2 and 2 inch): $1,286 to $1,857 from 2 utility schedules, both for utility installs. No business on this list prints a price for a commercial size.

Sources: Affordable Backflow Testing (Winter Garden, FL), Honest Prices; Pinellas County (FL), Utilities Water System User Fees; Fallbrook Public Utility District (CA), 2026 meter and service installation charges; Sprinkler Doctor (Denver metro, CO), Sprinkler Repair and Pricing Guide

Repair and rebuild prices

When an assembly fails its test, the fix is either a repair (new rubber parts, springs or a relief valve inside the same body, then a retest) or a new assembly. Two businesses on this list print repair prices.

A repair visit or rebuild runs $99 to $200 before parts in these price lists (2 sources); single parts such as a test cock, disc or spring run $10 to $25.

Sources: Affordable Backflow Testing (Winter Garden, FL), Honest Prices; Sprinkler Doctor (Denver metro, CO), Sprinkler Repair and Pricing Guide

Repair kits: what the parts cost

A repair kit is the rubber and springs inside one assembly, sold by brand, model and size. Online parts retailers print list prices, and these are the parts only: the tester's labor, the trip and the retest come on top. Parts generally do not interchange between brands, so the kit must match the assembly's model and size.

RP kits for 3/4 to 1 inch assemblies: $68.22 to $362.47 (2 retailers).

DC kits for 3/4 to 1 inch assemblies: $68.22 (1 retailer, so treat it as one data point).

PVB kits for 3/4 to 1 inch assemblies: $144.72 (1 retailer, so treat it as one data point).

Sources: Backflow Supply, backflow repair kits (online parts retailer); Sprinkler Supply Store, Conbraco 40-004-A2 check poppet repair kit (online parts retailer); Sprinkler Warehouse, RPZ repair parts

Hourly rates for backflow repair

Published hourly rates for backflow repair run $100 to $377 an hour (3 sources). The low end is a residential irrigation company in Missouri and a California city's on-call contract; the high end is a park district contract in Ohio for repairs on vaulted devices. Parts are extra in all three.

Sources: St. Charles Irrigation (MO), Services; City of Oxnard (CA), bid tabulation PW 23-72R, on-call backflow testing, repair and replacement; Cleveland Metroparks (OH), backflow testing and repair price list 2025 to 2026

Permit, filing and retest fees

Cities charge plumbing permit fees for backflow devices, and utilities want a passing test on every new or repaired assembly. These fees come on top of the contractor's price.

Plumbing permit and filing fees for one backflow device run $24 to $81 on the city schedules here (4 sources); Gig Harbor adds a $34 fee to issue each permit.

Where the utility does the test itself, a retest after a repair costs $42 to $45 (2 utilities). If a private tester did the first test, ask whether the retest is in the price.

Sources: City of Gig Harbor (WA), plumbing permit fees; City of Little Rock (AR), permit fee ordinance; City of Jonesboro (AR), inspections and planning fees; City of Dallas (TX), Development Services fee schedule; Metro Water Services (Nashville, TN), Cross Connections Program; Hallsdale-Powell Utility District (Knoxville, TN), Water Safety Tips

Repair or replace?

Worn seals, springs and check parts can be replaced inside the same body. Sprinkler Doctor, a Denver irrigation company, says rubber seals and moving parts wear out over time and can start leaking or failing under pressure.

A crack in the brass body means a new assembly: the body can no longer hold pressure. Sprinkler Doctor notes that outdoor assemblies sit above ground, exposed to freezing, and that water trapped inside over winter can crack them.

Old models can be hard to repair because parts are scarce, and when the same assembly has needed several repairs, replacing it may end the repeat visits.

On age: one parts retailer says an RPZ can last 10 to 15 years with maintenance, and a Florida tester says most units fail somewhere between 10 and 20 years.

Sources: Sprinkler Doctor (Denver metro, CO), Should You Repair or Replace a Damaged Backflow?; Sprinkler Warehouse, RPZ repair parts; Affordable Backflow Testing (Winter Garden, FL), Honest Prices

After a failed test: the rules that add cost

Every repaired or replaced assembly is tested again before it counts. Portland's water bureau says so in plain words, and Ohio EPA's manual says repaired or replacement units must pass the standard test before they go back in service.

Utilities set deadlines. Boulder, Colorado wants a failing test reported within 24 hours and, if the repair takes more than 30 days, a compliance plan.

Some utilities want approval before a replacement. Portland requires its water bureau's approval first, and Nashville says a replaced device must be moved to meet its current installation and access standards.

Phoenix requires a test report for every replacement of a backflow preventer, the same as for a new install.

Sources: Portland Water Bureau (OR), testing requirements and reports; Ohio EPA, backflow prevention and cross-connection control manual; City of Boulder (CO), backflow prevention; Metro Water Services (Nashville, TN), Cross Connections Program; City of Phoenix (AZ), backflow tester application packet

Sources and dates

• Affordable Backflow Testing (Winter Garden, FL), Honest Prices, read October 9, 2026https://www.affordablebackflowtest.com/honest-prices
• Pinellas County (FL), Utilities Water System User Fees, read October 9, 2026https://pinellas.gov/utilities-water-system-user-fees/
• Fallbrook Public Utility District (CA), 2026 meter and service installation charges, read October 9, 2026https://www.fpud.com/files/4072e0a63/2026+Water-Sewer+Installation.pdf
• Sprinkler Doctor (Denver metro, CO), Sprinkler Repair and Pricing Guide, read October 9, 2026https://www.sprinklerdoctor.org/pricing/
• Backflow Supply, backflow repair kits (online parts retailer), read October 9, 2026https://backflow-supply.com/collections/backflow-repair-kits
• Sprinkler Supply Store, Conbraco 40-004-A2 check poppet repair kit (online parts retailer), read October 9, 2026https://www.sprinklersupplystore.com/collections/backflow-prevention-devices/products/conbraco-3-4-x-1-rpz-dcv-repair-kit
• Sprinkler Warehouse, RPZ repair parts, read October 9, 2026https://www.sprinklerwarehouse.com/product/repair-parts/backflow-repair-parts/reduced-pressure-zone-assembly-rpz-parts
• St. Charles Irrigation (MO), Services, read October 9, 2026https://saintcharlesirrigation.com/services
• City of Oxnard (CA), bid tabulation PW 23-72R, on-call backflow testing, repair and replacement, read October 9, 2026https://oxnard.gov/wp-content/uploads/Bid-Tabulation-PW-23-72R.pdf
• Cleveland Metroparks (OH), backflow testing and repair price list 2025 to 2026, read October 9, 2026https://www.clevelandmetroparks.com/getmedia/71a94c37-ed91-4ad3-8364-1799eb83df08/Backflow-price-list-2025_2026.pdf
• City of Gig Harbor (WA), plumbing permit fees, read October 9, 2026https://gigharborwa.gov/DocumentCenter/View/150/Plumbing-Permit-Fees-PDF
• City of Little Rock (AR), permit fee ordinance, read October 9, 2026https://littlerock.gov/media/4978/fee-ordinance-number.pdf
• City of Jonesboro (AR), inspections and planning fees, read October 9, 2026https://www.jonesboroar.gov/DocumentCenter/View/3697/Inspections--Planning-Fees
• City of Dallas (TX), Development Services fee schedule, read October 9, 2026https://dallascityhall.com/departments/sustainabledevelopment/DCH%20documents/DSD%20Fees.pdf
• Metro Water Services (Nashville, TN), Cross Connections Program, read October 9, 2026https://www.nashville.gov/departments/water/customers/cross-connections-program
• Hallsdale-Powell Utility District (Knoxville, TN), Water Safety Tips, read October 9, 2026https://hpud.org/water-safety-tips-2/
• Sprinkler Doctor (Denver metro, CO), Should You Repair or Replace a Damaged Backflow?, read October 9, 2026https://www.sprinklerdoctor.org/repair-or-replace-backflow-preventer/
• Portland Water Bureau (OR), testing requirements and reports, read October 9, 2026https://www.portland.gov/water/backflow-prevention/testing-requirements-and-reports
• Ohio EPA, backflow prevention and cross-connection control manual, read October 9, 2026https://dam.assets.ohio.gov/image/upload/epa.ohio.gov/Portals/28/documents/rules/proposed/BFP-Manual_Final_Sept2015.pdf
• City of Boulder (CO), backflow prevention, read October 9, 2026https://bouldercolorado.gov/services/backflow-prevention
• City of Phoenix (AZ), backflow tester application packet, read October 9, 2026https://www.phoenix.gov/content/dam/phoenix/pddsite/documents/trt/external/dsd_trt_pdf_00336.pdf