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Updated 2026-10-15
County water report

New London County Water Quality: 5 Cities Ranked by the Records

New London County, Connecticut: 5 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 New London 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 5 tested4.0 ng/L federal MCL (2024) · US EPAHighest16.2 ng/L
Perfluorooctanoic acid (PFOA)Detected in 2 systems of 5 tested4.0 ng/L federal MCL (2024) · US EPAHighest9.2 ng/L
Perfluorohexanesulfonic acid (PFHxS)Detected in 1 system of 5 tested10 ng/L federal MCL (2024) · US EPAHighest12.5 ng/L
Lead (90th percentile)Detected in 2 systems of 5 tested15 µg/L federal action level · US EPAHighest1.5 µg/L
Perfluorobutanesulfonic acid (PFBS)Detected in 2 systems of 5 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest6 ng/L
Perfluorohexanoic acid (PFHxA)Detected in 1 system of 5 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest5.4 ng/L
Perfluoroheptanoic acid (PFHpA)Detected in 1 system of 5 testedNo federal or state limit; shown for transparencyHighest3 ng/L
Perfluoropentanoic acid (PFPeA)Detected in 2 systems of 5 testedNo federal or state limit; shown for transparencyHighest5.6 ng/L
23 substances tested, none detected in any systemShow

Tested in these 5 systems: EAST LYME WATER & SEWER COMMISSION, GROTON UTILITIES, NEW LONDON DEPT. OF PUBLIC UTILITIES, NORWICH PUBLIC UTILITIES, WATERFORD WPCA

  • 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)
  • Perfluorobutanoic acid (PFBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluorononanoic acid (PFNA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
5 cities

Cities ranked by the records

Showing 5 of 5 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 New London County2 of 5 city reports had a PFAS sample above a 2024 EPA limit
  1. Norwich16.2 ng/L
  2. East Lyme7.2 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Connecticut
Lead

0of 5 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 Connecticut
Who supplies the county

Largest water systems

  1. NorwichNORWICH PUBLIC UTILITIES · CT1040011
    36,163 served
  2. GrotonGROTON UTILITIES · CT0590011
    30,200 served
  3. New LondonNEW LONDON DEPT. OF PUBLIC UTILITIES · CT0950011
    27,620 served
  4. WaterfordWATERFORD WPCA · CT1520071
    16,578 served
  5. East LymeEAST LYME WATER & SEWER COMMISSION · CT0450011
    15,245 served
Questions

Frequently asked

How does New London County tap water compare across cities?

PurityMap ranks 5 cities in New London 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 New London's main water system: NEW LONDON DEPT. OF PUBLIC UTILITIES · PWSID CT0950011 · Purity Score 100 (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 New London County cities had a PFAS sample above a 2024 EPA limit?

2 of 5 New London County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Norwich (PFOS 16.2 ng/L), East Lyme (PFOA 9.2 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 New London County tap water?

Utilities report lead as a 90th-percentile result from home taps. 2 of 5 New London 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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