Public water system · MA1137000
ActiveHolyoke Water Works
At a glance
Holyoke Water Works (PWSID MA1137000) is an active community water system in Hampden County, Massachusetts. It reports serving 37,838 people through 8,181 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2018.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
37,838
Service connections
8,181
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Holyoke Water Works compare with other water systems in Hampden County?
By EPA's size categories, Holyoke Water Works is a large system (10,001 to 100,000 people). Hampden County has 115 active public water systems, and Holyoke Water Works is the 4th-largest of them by population served. Its population served is about 9.9 times the county average of 3,821 people per system, and accounts for 8.6% of the 439,404 people reported by systems filed under the county. Across Massachusetts, the 1,636 active systems average 6,275 people each. Nationally, the average active community water system reports serving 6,703 people, so Holyoke Water Works is about 5.6 times that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Massachusetts has 531 active community water systems, 32% of the state's 1,636 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 76 Massachusetts systems (4.6%) list surface water as their primary source.
Who owns and regulates Holyoke Water Works?
EPA lists Holyoke Water Works as owned by a local government. The MA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 31 of the 115 active systems in Hampden County (27%) are also owned by a local government.
Does Holyoke Water Works have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2018. The violations listed here began between July 2018 and July 2018. By type: 12 monitoring and reporting. The contaminants or rules involved are Toxaphene, 2,4,5-TP (Silvex), 2,3,7,8-TCDD (dioxin) and Methoxychlor. EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2018-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toxaphenecode 2020 | No | Resolved |
| 2018-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | 2,4,5-TP (Silvex)code 2110 | No | Resolved |
| 2018-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | 2,3,7,8-TCDD (dioxin)code 2063 | No | Resolved |
| 2018-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Methoxychlorcode 2015 | No | Resolved |
| 2018-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbofurancode 2046 | No | Resolved |
| 2018-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Heptachlorcode 2065 | No | Resolved |
| 2018-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Simazinecode 2037 | No | Resolved |
| 2018-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Lindane (gamma-BHC)code 2010 | No | Resolved |
| 2018-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Di(2-ethylhexyl) adipatecode 2035 | No | Resolved |
| 2018-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Atrazinecode 2050 | No | Resolved |
| 2018-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Ethylene dibromide (EDB)code 2946 | No | Resolved |
| 2018-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Pentachlorophenolcode 2326 | No | Resolved |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Holyoke Water Works: frequently asked questions
Who runs Holyoke Water Works?
Holyoke Water Works (PWSID MA1137000) is a community water system owned by a local government. It is regulated by the MA state drinking water program.
How many people does Holyoke Water Works serve?
Holyoke Water Works reports serving 37,838 people through 8,181 service connections in Hampden County, Massachusetts.
Where does Holyoke Water Works get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Holyoke Water Works have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2018. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Holyoke Water Works' water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2018. For current results, consult the system's annual water quality report, EPA ECHO, or the MA state drinking water program.
Where can I find Holyoke Water Works' water quality report?
As a community water system, Holyoke Water Works must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Hampden County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Springfield Water and Sewer Commission | Hampden | 169,170 | Community | Surface water |
| Chicopee Water Dept (MWRA) | Hampden | 55,560 | Community | Purchased surface water |
| Westfield Dpwwater Division | Hampden | 41,094 | Community | Surface water |
| West Springfield Dpw Water Division | Hampden | 28,835 | Community | Groundwater |
| Agawam Water Department | Hampden | 28,692 | Community | Purchased surface water |
| East Longmeadow Dpw Water Dept | Hampden | 16,358 | Community | Purchased surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Holyoke Water Works, PWSID MA1137000, Massachusetts”, https://aquacensus.com/water-systems/massachusetts/holyoke-water-works-ma1137000 (data as of October 1, 2026).