Chester Water Dept
Published drinking-water records and contacts for Chester Water Dept. System MA1059000. Review sources and dates; not a real-time water assessment.
- System ID
- MA1059000
- State or territory
- MA
- Published population served
- 750
- System type (source code)
- CWS
Published records and dates
- Lead and copper monitoring summaries: 16 — 1993-07-01 – 2020-12-31
- Massachusetts EEA PFAS monitoring results: 198 — 2021-07-15 – 2025-04-29
Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.
Published testing results
Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.
“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example
Lead and copper: 90th-percentile summaries
These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile
| Substance | Published 90th percentile | Monitoring period | Source quarter |
|---|---|---|---|
| Lead (PB90) | 0.0047 mg/L | 2018-01-01 – 2020-12-31 | 2026Q3 |
| Lead (PB90) | 0.0033 mg/L | 2015-01-01 – 2017-12-31 | 2026Q3 |
| Lead (PB90) | 0.0038 mg/L | 2014-01-01 – 2014-12-31 | 2026Q3 |
| Lead (PB90) | 0.0034 mg/L | 2013-01-01 – 2013-12-31 | 2026Q3 |
| Lead (PB90) | 0.0051 mg/L | 2011-01-01 – 2011-12-31 | 2026Q3 |
| Lead (PB90) | 0.0058 mg/L | 2010-07-01 – 2010-12-31 | 2026Q3 |
| Lead (PB90) | 0.007 mg/L | 2010-01-01 – 2010-06-30 | 2026Q3 |
| Lead (PB90) | 0.006 mg/L | 2007-01-01 – 2009-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| PERFLUOROHEXANOIC ACID - PFHXA | Below a limit; numeric threshold unavailable ng/L | 2025-04-29 | POINT OF ENTRY POST TREATMENT / Massachusetts EEA PFAS monitoring results |
| 4,8-DIOXA-3H-PERFLUORONONANOIC ACID - ADONA | Below a limit; numeric threshold unavailable ng/L | 2025-04-29 | POINT OF ENTRY POST TREATMENT / Massachusetts EEA PFAS monitoring results |
| HEXAFLUOROPROPYLENE OXIDE DIMER ACID - HFPO-DA | Below a limit; numeric threshold unavailable ng/L | 2025-04-29 | POINT OF ENTRY POST TREATMENT / Massachusetts EEA PFAS monitoring results |
| PERFLUOROTRIDECANOIC ACID - PFTRDA | Below a limit; numeric threshold unavailable ng/L | 2025-04-29 | POINT OF ENTRY POST TREATMENT / Massachusetts EEA PFAS monitoring results |
| PERFLUOROOCTANOIC ACID-PFOA | Below a limit; numeric threshold unavailable ng/L | 2025-04-29 | POINT OF ENTRY POST TREATMENT / Massachusetts EEA PFAS monitoring results |
| PERFLUOROHEXANESULFONIC ACID-PFHXS | Below a limit; numeric threshold unavailable ng/L | 2025-04-29 | POINT OF ENTRY POST TREATMENT / Massachusetts EEA PFAS monitoring results |
| PERFLUORODECANOIC ACID - PFDA | Below a limit; numeric threshold unavailable ng/L | 2025-04-29 | POINT OF ENTRY POST TREATMENT / Massachusetts EEA PFAS monitoring results |
| PERFLUOROUNDECANOIC ACID - PFUNA | Below a limit; numeric threshold unavailable ng/L | 2025-04-29 | POINT OF ENTRY POST TREATMENT / Massachusetts EEA PFAS monitoring results |
| PERFLUOROHEPTANOIC ACID-PFHPA | Below a limit; numeric threshold unavailable ng/L | 2025-04-29 | POINT OF ENTRY POST TREATMENT / Massachusetts EEA PFAS monitoring results |
| PERFLUORONONANOIC ACID-PFNA | Below a limit; numeric threshold unavailable ng/L | 2025-04-29 | POINT OF ENTRY POST TREATMENT / Massachusetts EEA PFAS monitoring results |
| 11-CHLOROEICOSAFLUORO-3-OXAUNDECANE-1-SULFONIC ACID-11CL-PF3OUDS | Below a limit; numeric threshold unavailable ng/L | 2025-04-29 | POINT OF ENTRY POST TREATMENT / Massachusetts EEA PFAS monitoring results |
| N-ETHYL PERFLUOROOCTANESULFONAMIDOACETIC ACID - NETFOSAA | Below a limit; numeric threshold unavailable ng/L | 2025-04-29 | POINT OF ENTRY POST TREATMENT / Massachusetts EEA PFAS monitoring results |
State sampling points can include untreated water. Publisher qualifiers and units are retained; consult the full source notes before interpreting a record.
Download state records with source notes (CSV)
Published compliance history
138 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
| Rule / record | Period | Recorded status | Health-based (EPA classification) | Source quarter |
|---|---|---|---|---|
| Long Term 2 Enhanced Surface Water Treatment Rule / Treatment Technique (SWTR and GWR) | 2024-07-01 – 2024-07-31 | Archived | Yes | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average | 2024-07-01 – 2024-09-30 | Archived | Yes | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average | 2024-04-01 – 2024-06-30 | Archived | Yes | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average | 2024-04-01 – 2024-06-30 | Archived | Yes | 2026Q3 |
| Lead and Copper Rule / Lead Consumer Notice | 2023-10-10 – — | Resolved | No | 2026Q3 |
| Lead and Copper Rule / Follow-up Or Routine LCR Tap M/R | 2023-06-01 – — | Addressed | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average | 2020-04-01 – 2020-06-30 | Archived | Yes | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average | 2020-01-01 – 2020-03-31 | Archived | Yes | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average | 2019-10-01 – 2019-12-31 | Archived | Yes | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2019-07-01 – 2019-09-30 | Archived | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average | 2019-07-01 – 2019-09-30 | Archived | Yes | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2019-07-01 – 2019-09-30 | Resolved | No | 2026Q3 |
| Synthetic Organic Chemicals / Monitoring, Regular | 2019-07-01 – 2019-09-30 | Resolved | No | 2026Q3 |
| Synthetic Organic Chemicals / Monitoring, Regular | 2019-07-01 – 2019-09-30 | Resolved | No | 2026Q3 |
| Synthetic Organic Chemicals / Monitoring, Regular | 2019-07-01 – 2019-09-30 | Resolved | No | 2026Q3 |
| Synthetic Organic Chemicals / Monitoring, Regular | 2019-07-01 – 2019-09-30 | Resolved | No | 2026Q3 |
| Synthetic Organic Chemicals / Monitoring, Regular | 2019-07-01 – 2019-09-30 | Resolved | No | 2026Q3 |
| Synthetic Organic Chemicals / Monitoring, Regular | 2019-07-01 – 2019-09-30 | Resolved | No | 2026Q3 |
| Synthetic Organic Chemicals / Monitoring, Regular | 2019-07-01 – 2019-09-30 | Resolved | No | 2026Q3 |
| Synthetic Organic Chemicals / Monitoring, Regular | 2019-07-01 – 2019-09-30 | Resolved | No | 2026Q3 |
Source dates and refresh checks
A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.
- EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
- EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
- EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
- Massachusetts EEA PFAS monitoring results — last successful check: 2026-10-12
Administrative contact (EPA filing)
Chester Water Dept: 4133547760
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.