Lake Hopatcong, New Jersey Water Quality Report
Water quality data for 4 water systems serving 13,160 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 17.1 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 171% | Above guideline |
| PFBA | 0.007 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.007 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHpA | 0.004 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxA | 0.010 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFOA | 0.011 | 0.004 ug/L | 0.090 ug/L(EWG) | 288% | Above limit |
| PFOS | 0.010 | 0.004 ug/L | 0.300 ug/L(EWG) | 245% | Above limit |
| PFPeA | 0.017 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
Recommended Water Filters
Based on the contaminants detected in your water supply, these filtration systems are recommended:
Reverse Osmosis (RO)
Reverse osmosis systems remove up to 99% of PFAS compounds. Recommended for homes with detected PFAS.
Up to 99% PFAS removal
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Compliance & Violations
Active Violations (6)
4B
Jul 11, 2025
4B
Jun 11, 2025
4A
Dec 10, 2024
4A
Dec 10, 2024
66
Dec 30, 2023
5A
Feb 22, 2018
Resolved Violations (494)
3A
Sep 1, 2025 — Sep 30, 2025
75
Jun 21, 2025
75
Jun 21, 2025
3A
Jun 1, 2025 — Jun 30, 2025
3A
Jun 1, 2025 — Jun 30, 2025
+ 489 more resolved violations
Frequently Asked Questions
Is Lake Hopatcong tap water safe to drink?
Lake Hopatcong's water has 2 contaminants detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in Lake Hopatcong tap water?
8 contaminants have been detected in Lake Hopatcong's water supply across 4 water systems. See the full contaminant table above for details.
How can I improve my water quality in Lake Hopatcong?
Install a water filter rated for the specific contaminants found in Lake Hopatcong's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Lake Hopatcong have any water quality violations?
Yes, Lake Hopatcong currently has 43 active violations. See the violations section above for details.