Community Water System · PWSID NJ1414011

Jefferson Twp W U Lk Hop

Serves 8,500 peopleGroundwaterOwner: Local GovernmentLake Hopatcong, New Jersey
Nothing open that measures the water, but 2 open testing or paperwork violations.

A missed test is not evidence of bad water. It also is not evidence of good water: for that period nobody checked.

On record since 2010: 62 violations. 8 treatment lapses · 38 missed or late tests · 16 notices or reports. Most recent began 2025-09-01.

None of them is a measurement of contaminated water.

For this year's test results, ask the utility for its annual Consumer Confidence Report. Every community system must publish one.

0Over the limit
8Treatment lapse
38Missed or late test
16Notice or report2 open

More violations on record than 97% of active water systems in New Jersey. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

20052010 · Missed or late test: 120102011 · Notice or report: 12012 · Missed or late test: 32012 · Missed or late test: 32013 · Notice or report: 12015 · Notice or report: 120152016 · Missed or late test: 12017 · Missed or late test: 12018 · Missed or late test: 22018 · Notice or report: 12020 · Missed or late test: 32020 · Missed or late test: 32020 · Notice or report: 220202021 · Missed or late test: 22022 · Treatment lapse: 22022 · Missed or late test: 52022 · Missed or late test: 52022 · Missed or late test: 52023 · Treatment lapse: 22023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Notice or report: 52023 · Notice or report: 52023 · Notice or report: 52024 · Treatment lapse: 32024 · Treatment lapse: 32024 · Missed or late test: 62024 · Missed or late test: 62024 · Missed or late test: 62024 · Notice or report: 32024 · Notice or report: 32025 · Treatment lapse: 12025 · Missed or late test: 22025 · Notice or report: 22025
One square ≈ 2 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.
13% treatment lapse · 861% missed or late test · 3826% notice or report · 16

Across New Jersey, 74% of violations are missed or late tests and 2% are water over a limit.

Lead & copper at the tap

Utilities sample taps in homes most likely to have lead pipes, and report the 90th-percentile result: 9 in 10 homes sampled came in at or below this number. Above the red line (the action level) the utility must act. The action level is not a safe level; EPA's health goal for lead is zero. EPA's file does not date these results, so they are shown highest first.

Lead, 90th percentile 11 results on file · action level 15 ppb

3.5 ppb
1.1 ppb
0 ppb
0 ppb
0 ppb
0 ppb
0 ppb
0 ppb
0 ppb
0 ppb
0 ppb

Open now (2)

  1. 2025-07-11Revised Total Coliform RuleRPTOpen
  2. 2024-12-10Revised Total Coliform RuleRPTOpen

Every violation on record

  1. 2025-09-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  2. 2025-07-11Revised Total Coliform RuleRPTOpen
  3. 2025-06-21Public NoticePN Violation for NPDWR ViolationBack in compliance
  4. 2025-06-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  5. 2025-01-01Lead and Copper RuleWQP Entry Point/Tap Treatment Technique Non-CompliancePeriod ended · no return to compliance on file
  6. 2024-12-10Revised Total Coliform RuleRPTOpen
  7. 2024-09-19Revised Total Coliform RuleTTBack in compliance
  8. 2024-07-17E. ColiMonitoring, Source Water (GWR)Back in compliance
  9. 2024-07-01Lead and Copper RuleWQP Entry Point/Tap Treatment Technique Non-CompliancePeriod ended · no return to compliance on file
  10. 2024-07-01Lead and Copper RuleWater Quality Parameter M/RPeriod ended · no return to compliance on file
  11. 2024-06-19E. Coli ×2Monitoring, Source Water (GWR)Back in compliance
  12. 2024-05-10Public NoticePN Violation for NPDWR ViolationBack in compliance
  13. 2024-03-31Lead and Copper RuleLead Consumer NoticeBack in compliance
  14. 2024-01-11Revised Total Coliform RuleRPTBack in compliance
  15. 2024-01-01Lead and Copper RuleWater Quality Parameter M/RPeriod ended · no return to compliance on file
  16. 2024-01-01Lead and Copper RuleWQP Entry Point/Tap Treatment Technique Non-CompliancePeriod ended · no return to compliance on file
  17. 2023-12-01Revised Total Coliform RuleMONBack in compliance
  18. 2023-10-18E. ColiMonitoring, Source Water (GWR)Back in compliance
  19. 2023-10-11Revised Total Coliform RuleRPTBack in compliance
  20. 2023-10-06Public NoticePN Violation for NPDWR ViolationBack in compliance
  21. 2023-10-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  22. 2023-09-29Lead and Copper RuleLead Consumer NoticeBack in compliance
  23. 2023-09-01Revised Total Coliform RuleMONBack in compliance
  24. 2023-07-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  25. 2023-07-01Lead and Copper RuleWQP Entry Point/Tap Treatment Technique Non-CompliancePeriod ended · no return to compliance on file
Show the other 33 entries
  1. 2023-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  2. 2023-06-18Public NoticePN Violation for NPDWR ViolationBack in compliance
  3. 2023-04-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  4. 2023-04-01Lead and Copper RuleLead Consumer NoticeBack in compliance
  5. 2023-01-06Public NoticePN Violation for NPDWR ViolationBack in compliance
  6. 2023-01-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  7. 2023-01-01Lead and Copper RuleWQP Entry Point/Tap Treatment Technique Non-CompliancePeriod ended · no return to compliance on file
  8. 2023-01-01Chlorine ×2Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  9. 2023-01-01ChlorineMonitoring and Reporting (DBP)Back in compliance
  10. 2022-10-01Chlorine ×3Monitoring and Reporting (DBP)Back in compliance
  11. 2022-09-29Lead and Copper RuleLead Consumer NoticeBack in compliance
  12. 2022-07-01Lead and Copper RuleWQP Entry Point/Tap Treatment Technique Non-CompliancePeriod ended · no return to compliance on file
  13. 2022-07-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  14. 2022-01-01Lead and Copper RuleWQP Entry Point/Tap Treatment Technique Non-CompliancePeriod ended · no return to compliance on file
  15. 2021-07-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  16. 2021-01-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  17. 2020-10-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  18. 2020-08-20E. ColiMonitoring, Source Water (GWR)Back in compliance
  19. 2020-07-11Revised Total Coliform RuleRPTBack in compliance
  20. 2020-07-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  21. 2020-06-01Revised Total Coliform RuleMONBack in compliance
  22. 2018-12-30Lead and Copper RuleLead Consumer NoticeBack in compliance
  23. 2018-04-011,1-DichloroethyleneMonitoring, RegularBack in compliance
  24. 2018-02-22Revised Total Coliform RuleOtherBack in compliance
  25. 2017-01-011,1-DichloroethyleneMonitoring, RegularBack in compliance
  26. 2016-08-04E. ColiMonitoring, Source Water (GWR)Back in compliance
  27. 2015-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  28. 2013-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  29. 2012-11-15E. ColiMonitoring, Source Water (GWR)Back in compliance
  30. 2012-06-14E. ColiMonitoring, Source Water (GWR)Back in compliance
  31. 2012-01-12E. ColiMonitoring, Source Water (GWR)Back in compliance
  32. 2011-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  33. 2010-06-07E. ColiMonitoring, Source Water (GWR)Back in compliance

System details

Population served8,500
Service connections2,490
Water sourceGroundwater
System typeCommunity Water System
OwnerLocal Government
StatusActive
CityLake Hopatcong
EPA ZIP on file07849

Areas served

  • Morris County

Reading this record

Jefferson Twp W U Lk Hop is a community water system that draws from groundwater and serves about 8,500 people in Lake Hopatcong, New Jersey. Everything above comes from the EPA's Safe Drinking Water Information System (SDWIS), where states report every violation by every public water system.

Four kinds of violation. Only one is a measurement of the water: over the limit means a test came back above a legal maximum (an MCL). A treatment lapse means a required protective step was not done, such as disinfection, filtration, fixing a defect an inspector found, or filing a lead-pipe inventory. A missed or late test means a required test was skipped or never reported. That is the most common kind, and the most misread: it does not mean the water was bad, and it does not mean the water was fine. Notices and reports covers public notices and the annual Consumer Confidence Report.

Status. “Back in compliance” means the state recorded a return to compliance. “Period ended” means the violation's compliance period is over but no return to compliance was ever filed, which is common in older records. EPA's federal copy lags state records by months, so call the utility for anything current.