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Updated 2026-10-15
County water report

Collier County Water Quality: 3 Cities Ranked by the Records

Collier County, Florida: 3 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my systemOpen on the mapPrivate wells in Collier County
Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Perfluorooctanesulfonic acid (PFOS)Detected in 2 systems of 3 tested4.0 ng/L federal MCL (2024) · US EPAHighest12.1 ng/L
Perfluorooctanoic acid (PFOA)Detected in 2 systems of 3 tested4.0 ng/L federal MCL (2024) · US EPAHighest4.2 ng/L
Perfluorohexanesulfonic acid (PFHxS)Detected in 1 system of 3 tested10 ng/L federal MCL (2024) · US EPAHighest4.4 ng/L
Lead (90th percentile)Detected in 3 systems15 µg/L federal action level · US EPAHighest1.3 µg/L
Perfluorobutanesulfonic acid (PFBS)Detected in 1 system of 3 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest3.7 ng/L
Perfluorobutanoic acid (PFBA)Detected in 1 system of 3 testedNo federal or state limit; shown for transparencyHighest5.2 ng/L
Perfluoropentanoic acid (PFPeA)Detected in 1 system of 3 testedNo federal or state limit; shown for transparencyHighest5.1 ng/L
24 substances tested, none detected in any systemShow

Tested in these 3 systems: COLLIER COUNTY REGIONAL WTP, IMMOKALEE WATER, NAPLES WATER DEPT

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
  • Lithium
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluoroheptanoic acid (PFHpA)
  • Perfluorohexanoic acid (PFHxA)
  • Perfluorononanoic acid (PFNA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
3 cities

Cities ranked by the records

Showing 3 of 3 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Collier County2 of 3 city reports had a PFAS sample above a 2024 EPA limit
  1. Immokalee12.1 ng/L
  2. Naples11 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Florida
Lead

0of 3 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Florida
Who supplies the county

Largest water systems

  1. Golden GateCOLLIER COUNTY REGIONAL WTP · FL5114069
    216,993 served
  2. NaplesNAPLES WATER DEPT · FL5110198
    83,804 served
  3. ImmokaleeIMMOKALEE WATER · FL5110142
    26,841 served
Questions

Frequently asked

How does Collier County tap water compare across cities?

PurityMap ranks 3 cities in Collier County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Golden Gate's main water system: COLLIER COUNTY REGIONAL WTP · PWSID FL5114069 · Purity Score 99 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Collier County cities had a PFAS sample above a 2024 EPA limit?

2 of 3 Collier County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Immokalee (PFOS 12.1 ng/L), Naples (PFOS 11 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 2.

Is there lead in Collier County tap water?

Utilities report lead as a 90th-percentile result from home taps. 3 of 3 Collier County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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