Non-Transient Non-Community · PWSID NJ2104305

Blairstown Commons

Serves 238 peopleGroundwaterOwner: PrivateDenville, New Jersey
1 open treatment violation.

Open for: Lead and Copper Rule. EPA counts treatment-technique violations as health-based: a required protective step was not done. It is not a measurement of contamination.

On record since 2018: 28 violations. 1 over the limit · 2 treatment lapses · 25 missed or late tests. Most recent began 2025-04-01.

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

1Over the limit
2Treatment lapse1 open
25Missed or late test
0Notice or report

More violations on record than 91% 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

2005201020152018 · Over the limit: 12018 · Treatment lapse: 120202021 · Treatment lapse: 12021 · Missed or late test: 12022 · Missed or late test: 12023 · Missed or late test: 12024 · Missed or late test: 212024 · Missed or late test: 212024 · Missed or late test: 212024 · Missed or late test: 212024 · Missed or late test: 212024 · Missed or late test: 212024 · Missed or late test: 212024 · Missed or late test: 212024 · Missed or late test: 212024 · Missed or late test: 212024 · Missed or late test: 212025 · Missed or late test: 12025
One square ≈ 2 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.
4% over the limit · 17% treatment lapse · 289% missed or late test · 25

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

What you can do

  • Lead: Run cold water for 30 seconds to 2 minutes before using it for drinking or cooking, especially after the water has been sitting for several hours. Use only cold water for cooking and baby formula. Consider a water filter certified to remove lead (look for NSF/ANSI Standard 53 certification). Have your water tested if you live in an older home.

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 13 results on file · action level 15 ppb

7 ppb
6.6 ppb
5.2 ppb
5 ppb
4.5 ppb
4.3 ppb
4.3 ppb
4 ppb
1.7 ppb
1.7 ppb
0.87 ppb
0 ppb
0 ppb

Copper, 90th percentile 3 results on file · action level 1.3 mg/L

6.5 mg/L
3.4 mg/L
2.2 mg/L

Open now (1)

  1. 2021-12-12Lead and Copper RuleOCCT/SOWT Treatment Installation/DemonstrationOpen

Every violation on record

  1. 2025-04-01Lead and Copper RuleLead Consumer NoticeBack in compliance
  2. 2024-01-01StyreneMonitoring, RegularPeriod ended · no return to compliance on file
  3. 2024-01-01EthylbenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  4. 2024-01-01TolueneMonitoring, RegularPeriod ended · no return to compliance on file
  5. 2024-01-01BenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  6. 2024-01-01ChlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  7. 2024-01-01TetrachloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
  8. 2024-01-011,1,2-TrichloroethaneMonitoring, RegularPeriod ended · no return to compliance on file
  9. 2024-01-01TrichloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
  10. 2024-01-011,2-DichloropropaneMonitoring, RegularPeriod ended · no return to compliance on file
  11. 2024-01-01Carbon tetrachlorideMonitoring, RegularPeriod ended · no return to compliance on file
  12. 2024-01-011,1,1-TrichloroethaneMonitoring, RegularPeriod ended · no return to compliance on file
  13. 2024-01-011,2-DichloroethaneMonitoring, RegularPeriod ended · no return to compliance on file
  14. 2024-01-01trans-1,2-DichloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
  15. 2024-01-011,1-DichloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
  16. 2024-01-01Vinyl chlorideMonitoring, RegularPeriod ended · no return to compliance on file
  17. 2024-01-01p-DichlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  18. 2024-01-01o-DichlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  19. 2024-01-01DichloromethaneMonitoring, RegularPeriod ended · no return to compliance on file
  20. 2024-01-01Xylenes, TotalMonitoring, RegularPeriod ended · no return to compliance on file
  21. 2024-01-01cis-1,2-DichloroethyleneMonitoring, RegularPeriod ended · no return to compliance on file
  22. 2024-01-011,2,4-TrichlorobenzeneMonitoring, RegularPeriod ended · no return to compliance on file
  23. 2023-09-29Lead and Copper RuleLead Consumer NoticeBack in compliance
  24. 2022-09-29Lead and Copper RuleLead Consumer NoticeBack in compliance
  25. 2021-12-12Lead and Copper RuleOCCT/SOWT Treatment Installation/DemonstrationOpen
Show the other 3 entries
  1. 2021-04-01Lead and Copper RuleLead Consumer NoticeBack in compliance
  2. 2018-10-06Revised Total Coliform RuleTTBack in compliance
  3. 2018-06-01Revised Total Coliform RuleMCLBack in compliance

System details

Population served238
Service connections1
Water sourceGroundwater
System typeNon-Transient Non-Community
OwnerPrivate
StatusActive
CityDenville
EPA ZIP on file07834

Areas served

  • Warren County

Reading this record

Blairstown Commons is a non-transient non-community that draws from groundwater and serves about 238 people in Denville, 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.