Sussex County Water Quality: 2 Cities Ranked by the Records
Sussex County, New Jersey: 2 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
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.
Perfluorooctanoic acid (PFOA)Detected in 2 systems4.0 ng/L federal MCL (2024) · US EPAHighest9.9 ng/L
- HOPATCONG WATER DEPT9.9 ng/LSample date: 2025-03-10 to 2026-01-13
- FRANKLIN TOWNSHIP DEPT OF PUBLIC WORKS9 ng/LSample date: 2024-10-02 to 2025-05-12
LithiumDetected in 1 system of 2 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest9.76 µg/L
- HOPATCONG WATER DEPT9.76 µg/LSample date: 2025-03-10 to 2025-09-15
- FRANKLIN TOWNSHIP DEPT OF PUBLIC WORKSNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-08-19 to 2025-05-12
Lead (90th percentile)Detected in 2 systems15 µg/L federal action level · US EPAHighest9.37 µg/L
- HOPATCONG WATER DEPT9.37 µg/LMonitoring period: 2026–2026 (still open)
- FRANKLIN TOWNSHIP DEPT OF PUBLIC WORKS2.34 µg/LMonitoring period: 2026–2026 (still open)
Perfluorobutanesulfonic acid (PFBS)Detected in 1 system of 2 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest7.7 ng/L
- HOPATCONG WATER DEPT7.7 ng/LSample date: 2025-03-10 to 2026-01-13
- FRANKLIN TOWNSHIP DEPT OF PUBLIC WORKSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-02 to 2025-05-12
Perfluorohexanoic acid (PFHxA)Detected in 2 systems400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest9 ng/L
- HOPATCONG WATER DEPT9 ng/LSample date: 2025-03-10 to 2026-01-13
- FRANKLIN TOWNSHIP DEPT OF PUBLIC WORKS3.8 ng/LSample date: 2024-10-02 to 2025-05-12
Perfluorobutanoic acid (PFBA)Detected in 2 systemsNo federal or state limit; shown for transparencyHighest11.6 ng/L
- HOPATCONG WATER DEPT11.6 ng/LSample date: 2025-03-10 to 2026-01-13
- FRANKLIN TOWNSHIP DEPT OF PUBLIC WORKS6.1 ng/LSample date: 2024-10-02 to 2025-05-12
Perfluoroheptanoic acid (PFHpA)Detected in 1 system of 2 testedNo federal or state limit; shown for transparencyHighest3.9 ng/L
- HOPATCONG WATER DEPT3.9 ng/LSample date: 2025-03-10 to 2026-01-13
- FRANKLIN TOWNSHIP DEPT OF PUBLIC WORKSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-10-02 to 2025-05-12
Perfluoropentanoic acid (PFPeA)Detected in 2 systemsNo federal or state limit; shown for transparencyHighest10.3 ng/L
- HOPATCONG WATER DEPT10.3 ng/LSample date: 2025-03-10 to 2026-01-13
- FRANKLIN TOWNSHIP DEPT OF PUBLIC WORKS4.5 ng/LSample date: 2024-10-02 to 2025-05-12
23 PFAS tested, none detected in any systemShow
Tested in these 2 systems: FRANKLIN TOWNSHIP DEPT OF PUBLIC WORKS, HOPATCONG 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)
- 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)
- Perfluorohexanesulfonic acid (PFHxS)
- Perfluorononanoic acid (PFNA)
- Perfluorooctanesulfonic acid (PFOS)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
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.
0of 2 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 New JerseyLargest water systems
Frequently asked
How does Sussex County tap water compare across cities?
PurityMap ranks 2 cities in Sussex 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 Franklin's main water system: FRANKLIN TOWNSHIP DEPT OF PUBLIC WORKS · PWSID NJ1808001 · Purity Score 53 (Poor) · 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 Sussex County cities had a PFAS sample above a 2024 EPA limit?
2 of 2 Sussex County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Hopatcong (PFOA 9.9 ng/L), Franklin (PFOA 9 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 Sussex County tap water?
Utilities report lead as a 90th-percentile result from home taps. 2 of 2 Sussex 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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