Community Water System · PWSID NJ1225001

Middlesex Water Company

Serves 233,376 peopleSurface WaterOwner: PrivateIselin, New Jersey
Nothing open right now.

On record since 2015: 19 violations. 1 treatment lapse · 15 missed or late tests · 3 notices or reports. Most recent began 2024-10-01.

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
1Treatment lapse
15Missed or late test
3Notice or report

More violations on record than 85% 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

200520102015 · Missed or late test: 120152017 · Missed or late test: 22017 · Missed or late test: 22018 · Missed or late test: 12018 · Notice or report: 12019 · Treatment lapse: 12020 · Missed or late test: 12020 · Notice or report: 120202022 · Missed or late test: 12022 · Notice or report: 12023 · Missed or late test: 62023 · Missed or late test: 62023 · Missed or late test: 62023 · Missed or late test: 62023 · Missed or late test: 62023 · Missed or late test: 62024 · Missed or late test: 32024 · Missed or late test: 32024 · Missed or late test: 32025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
5% treatment lapse · 179% missed or late test · 1516% notice or report · 3

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 17 results on file · action level 15 ppb

6.7 ppb
2 ppb
2 ppb
1.6 ppb
1.4 ppb
1.3 ppb
1.2 ppb
1.2 ppb
1.1 ppb
1 ppb
1 ppb
0.97 ppb
0.92 ppb
0.86 ppb
0.85 ppb
0.73 ppb
0.62 ppb

Every violation on record

  1. 2024-10-01Chlorine ×2Monitoring and Reporting (DBP)Period ended · no return to compliance on file
  2. 2024-07-01Lead and Copper RuleWater Quality Parameter M/RPeriod ended · no return to compliance on file
  3. 2023-07-01Lead and Copper RuleWater Quality Parameter M/RPeriod ended · no return to compliance on file
  4. 2023-07-01Ethylene DibromideMonitoring, RegularPeriod ended · no return to compliance on file
  5. 2023-07-011, 2-Dibromo-3-ChloropropaneMonitoring, RegularPeriod ended · no return to compliance on file
  6. 2023-05-01Groundwater RuleMonitoring of Treatment (SWTR-Unfilt/GWR)Period ended · no return to compliance on file
  7. 2023-04-01Lead and Copper RuleLead Consumer NoticeBack in compliance
  8. 2023-01-01Lead and Copper RuleWater Quality Parameter M/RPeriod ended · no return to compliance on file
  9. 2022-02-10Public NoticePN Violation without NPDWR ViolationBack in compliance
  10. 2022-01-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  11. 2020-07-01Lead and Copper RuleWater Quality Parameter M/RPeriod ended · no return to compliance on file
  12. 2020-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  13. 2019-07-01Lead and Copper RuleWQP Entry Point/Tap Treatment Technique Non-ComplianceBack in compliance
  14. 2018-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  15. 2018-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  16. 2017-07-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  17. 2017-01-01Lead and Copper RuleWater Quality Parameter M/RBack in compliance
  18. 2015-10-01ChlorineMonitoring and Reporting (DBP)Back in compliance

System details

Population served233,376
Service connections58,344
Water sourceSurface Water
System typeCommunity Water System
OwnerPrivate
StatusActive
CityIselin
EPA ZIP on file08830

Areas served

  • Middlesex County

Reading this record

Middlesex Water Company is a community water system that draws from surface water and serves about 233,376 people in Iselin, 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.