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The 10 Florida water systems serving 10,000 or more people with the highest PFOA or PFOS averages in EPA's latest PFAS data (UCMR 5, file dated Oct 15, 2026)

EPA UCMR 5 file dated Oct 15, 2026 · population from EPA SDWIS, Oct 14, 2026 · checked Nov 15, 2026

Ranked by each system's higher average of PFOA or PFOS in EPA's UCMR 5 testing. Monitoring results, not violations.

No. 1
MDWASA/Rex Utilities
serving Miami, FL
29.5ppt PFOS
10 samples, 2025

5 of these 10 serve communities in Miami-Dade County.

A clear glass of water on a sunlit counter.

Only utilities with at least 4 samples are ranked.

In Florida, 101 of 393 water systems with PFOA or PFOS results in EPA's UCMR 5 data averaged above 4.0 ppt.

Nationwide, 656 of 9,947 water systems with PFOA or PFOS results in EPA's UCMR 5 data averaged above 4.0 ppt.

Systems serving 10,000 or more people (EPA SDWIS population served, Oct 14, 2026)

Systems serving 10,000 or more people (EPA SDWIS population served, Oct 14, 2026)
RankWater systemPFOA averagePFOS averagePeople served (EPA SDWIS, Oct 14, 2026)Sample yearsEPA's 2024 level (4.0 ppt)
1MDWASA/Rex Utilitiesserving Miami, FLPWSID FL41312025.2 ppt10 samples29.5 ppt10 samples45,2002025Above 4.0 ppt
2North Miami, City ofserving North Miami, FLPWSID FL41309776.0 ppt4 samples28.0 ppt4 samples89,3492023 to 2024Above 4.0 ppt
3Tarpon Springs Water System(Tarpon Springs, FL in EPA records)PWSID FL6521784Tarpon Springs opened a reverse osmosis plant in 2015 (Treatment Plant Operator). Source6.5 ppt6 samples23.4 ppt6 samples28,8752023Above 4.0 ppt
4Homestead, City ofserving Homestead, FLPWSID FL41306450.0 ppt4 samples22.5 ppt4 samples80,0002025Above 4.0 ppt
5City of Temple Terrace Utility(Temple Terrace, FL in EPA records)PWSID FL6291791Temple Terrace's city council is weighing a roughly $73 million treatment plan (Tampa Bay Times, Aug. 2026). Source8.6 ppt4 samples18.5 ppt4 samples31,2502025Above 4.0 ppt
6MDWASA - Main Systemserving Miami, FLPWSID FL41308715.4 ppt8 samples14.2 ppt8 samples2,377,4602023 to 2024Above 4.0 ppt
7Hialeah, City ofserving Hialeah, FLPWSID FL41306043.0 ppt6 samples13.0 ppt6 samples238,0002023 to 2024Above 4.0 ppt
8Boynton Beach PWSserving Boynton Beach, FLPWSID FL45001454.2 ppt4 samples12.3 ppt4 samples112,0002023 to 2024Above 4.0 ppt
9VC/SOUTHWEST Water System(Orange City, FL in EPA records)PWSID FL36413367.7 ppt6 samples12.0 ppt6 samples19,6722024Above 4.0 ppt
10Peoples Water Service Company(Pensacola, FL in EPA records)PWSID FL11705273.4 ppt10 samples10.8 ppt10 samples24,8062023 to 2024Above 4.0 ppt

The 10 Florida water systems with the highest PFOA or PFOS averages, all system sizes (UCMR 5, file dated Oct 15, 2026)

The 10 Florida water systems with the highest PFOA or PFOS averages, all system sizes (UCMR 5, file dated Oct 15, 2026)
RankWater systemPFOA averagePFOS averagePeople served (EPA SDWIS, Oct 14, 2026)Sample yearsEPA's 2024 level (4.0 ppt)
1Orangewood Water System(Holiday, FL in EPA records)PWSID FL651131117.6 ppt10 samples64.3 ppt10 samples6,4642023Above 4.0 ppt
2Lake Panasoffkee Water Assn 2WPS(Lake Panasoffkee, FL in EPA records)PWSID FL66009906.2 ppt4 samples36.8 ppt4 samples4,6422023Above 4.0 ppt
3MDWASA/Rex Utilitiesserving Miami, FLPWSID FL41312025.2 ppt10 samples29.5 ppt10 samples45,2002025Above 4.0 ppt
4North Miami, City ofserving North Miami, FLPWSID FL41309776.0 ppt4 samples28.0 ppt4 samples89,3492023 to 2024Above 4.0 ppt
5Tarpon Springs Water System(Tarpon Springs, FL in EPA records)PWSID FL6521784Tarpon Springs opened a reverse osmosis plant in 2015 (Treatment Plant Operator). Source6.5 ppt6 samples23.4 ppt6 samples28,8752023Above 4.0 ppt
6Homestead, City ofserving Homestead, FLPWSID FL41306450.0 ppt4 samples22.5 ppt4 samples80,0002025Above 4.0 ppt
7City of Temple Terrace Utility(Temple Terrace, FL in EPA records)PWSID FL6291791Temple Terrace's city council is weighing a roughly $73 million treatment plan (Tampa Bay Times, Aug. 2026). Source8.6 ppt4 samples18.5 ppt4 samples31,2502025Above 4.0 ppt
8Gonzalez Utilities Association, Inc.(Cantonment, FL in EPA records)PWSID FL117030215.7 ppt6 samples3.5 ppt6 samples6,6682023 to 2024Above 4.0 ppt
9MDWASA - Main Systemserving Miami, FLPWSID FL41308715.4 ppt8 samples14.2 ppt8 samples2,377,4602023 to 2024Above 4.0 ppt
10Hialeah, City ofserving Hialeah, FLPWSID FL41306043.0 ppt6 samples13.0 ppt6 samples238,0002023 to 2024Above 4.0 ppt

Both tables: ranked on the higher exact average of PFOA or PFOS, with non-detects counted as zero. Only systems with at least 4 samples for that compound are ranked. Sample years are on each row.

Systems marked "Above 4.0 ppt" averaged above 4.0 ppt, the level EPA set in 2024, not yet enforceable (water systems must meet it by April 2029; EPA has proposed allowing until 2031). These are monitoring results, not violations.

Not a test of your tap. Download the data (CSV)

Systems serving 10,000 or more people

Bar chart of the 10 systems' highest PFOA or PFOS averages: MDWASA/Rex Utilities 29.5; North Miami, City of 28.0; Tarpon Springs Water System 23.4; Homestead, City of 22.5; City of Temple Terrace Utility 18.5; MDWASA - Main System 14.2; Hialeah, City of 13.0; Boynton Beach PWS 12.3; VC/SOUTHWEST Water System 12.0; Peoples Water Service Company 10.8 ppt.1. MDWASA/Rex Utilities29.5 PFOS2. North Miami, City of28.0 PFOS3. Tarpon Springs Water System23.4 PFOS4. Homestead, City of22.5 PFOS5. City of Temple Terrace Utility18.5 PFOS6. MDWASA - Main System14.2 PFOS7. Hialeah, City of13.0 PFOS8. Boynton Beach PWS12.3 PFOS9. VC/SOUTHWEST Water System12.0 PFOS10. Peoples Water Service Company10.8 PFOSEPA 2024 level: 4.0 ppt
Each bar is the system's higher exact average (ppt). The line marks 4.0 ppt, the level EPA set in 2024, not yet enforceable. Source: EPA UCMR 5, file dated October 15, 2026; ScoreYourWater analysis.

Highest PFOA or PFOS average, all system sizes

Bar chart of the 10 systems' highest PFOA or PFOS averages: Orangewood Water System 64.3; Lake Panasoffkee Water Assn 2WPS 36.8; MDWASA/Rex Utilities 29.5; North Miami, City of 28.0; Tarpon Springs Water System 23.4; Homestead, City of 22.5; City of Temple Terrace Utility 18.5; Gonzalez Utilities Association, Inc. 15.7; MDWASA - Main System 14.2; Hialeah, City of 13.0 ppt.1. Orangewood Water System64.3 PFOS2. Lake Panasoffkee Water Assn 2WPS36.8 PFOS3. MDWASA/Rex Utilities29.5 PFOS4. North Miami, City of28.0 PFOS5. Tarpon Springs Water System23.4 PFOS6. Homestead, City of22.5 PFOS7. City of Temple Terrace Utility18.5 PFOS8. Gonzalez Utilities Association, Inc.15.7 PFOA9. MDWASA - Main System14.2 PFOS10. Hialeah, City of13.0 PFOSEPA 2024 level: 4.0 ppt
Each bar is the system's higher exact average (ppt). The line marks 4.0 ppt, the level EPA set in 2024, not yet enforceable. Source: EPA UCMR 5, file dated October 15, 2026; ScoreYourWater analysis.

States with the most water systems averaging above 4.0 ppt

Bar chart of states by number of water systems above 4.0 ppt: FL 101; NJ 73; NC 60; CA 49; AL 45; PA 45; SC 45; OH 34; MA 29; TX 19.FL101 of 393NJ73 of 244NC60 of 283CA49 of 676AL45 of 306PA45 of 360SC45 of 163OH34 of 331MA29 of 261TX19 of 1,129
Systems whose PFOA or PFOS average was above 4.0 ppt, by state, out of systems with PFOA or PFOS results. Source: EPA UCMR 5, file dated October 15, 2026; ScoreYourWater analysis. Tribal systems are not assigned to a state.

How we did this

  • Each average is the exact mean of all of the system's UCMR 5 results for that compound, with non-detects counted as zero. Systems are ranked on the higher of the PFOA and PFOS averages, unrounded; the page shows one decimal.
  • Only utilities with at least 4 samples are ranked. Sample years are shown on each row.
  • EPA UCMR 5 file dated October 15, 2026 (samples through June 17, 2026). 214 Florida systems qualified.
  • The lead list uses the same method, limited to systems serving 10,000 or more people by EPA SDWIS population served (Oct 14, 2026).
  • Both values, PFOA and PFOS, are shown for each system. They are never blended into one PFAS average.

These are monitoring results, not violations. Not a test of your tap.

ScoreYourWater also sells water treatment systems.

Sources

  • EPA UCMR 5 occurrence data
  • EPA ECHO Safe Drinking Water Act data (system names, population served)
  • EPA PFAS drinking water rule (2024)

Utilities: see something wrong? Send a correction

Data as of October 14, 2026. The list is updated monthly. Corrections are noted in each monthly update.

More rankings

  • The national top 10
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