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Community Water System · PWS NH0781010

Errol Water Works/West

Errol, New Hampshire 03579 - drinking water served from groundwater sources to 183 people, tracked in EPA SDWIS and UCMR5.

183
People served
973
EPA violations
51
Health-based
Untested
UCMR5 result

The verdict

EPA records 973 drinking-water violations at Errol Water Works/West, 5% of them health-based - above the New Hampshire per-system average.

973
Total EPA violations on record
5%
Health-based (MCL / treatment failure)
183
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Errol Water Works/West

Errol Water Works/West is a local-owned community water system that delivers drinking water to 183 residents in Errol, New Hampshire (Coos County) through 69 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 973 total violations for this system , of which 51 (5%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 894 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 49 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across New Hampshire, EPA tracks 2,453 public water systems serving 1,242,123 people, with 155,970 cumulative violations and 29,649 health-based violations on record. About 90% of systems in the state carry at least one violation, and state-wide the average per system is 63.6 violations. Statewide, 23 of 51 UCMR5-tested systems have reported PFAS detections (45.1%).

Errol Water Works/West's 973 violations sit above the New Hampshire average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
183
Total Violations
973
Health-Based Violations
51
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
69
County
Coos
School/Daycare
No
MCL Violations
49
Monitoring Violations
894
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 49 2014
1,2,4-Trichlorobenzene MR 29 1996
Xylenes, Total MR 29 1996
1,1-Dichloroethylene MR 29 1996
trans-1,2-Dichloroethylene MR 29 1996
1,2-Dichloroethane MR 29 1996
1,2-Dichloropropane MR 29 1996
1,1,2-Trichloroethane MR 29 1996
CHLOROBENZENE MR 29 1996
Benzene MR 29 1996
Toluene MR 29 1996
Ethylbenzene MR 29 1996
DICHLOROMETHANE MR 29 1996
o-Dichlorobenzene MR 29 1996
p-Dichlorobenzene MR 29 1996
Vinyl chloride MR 29 1996
1,1,1-Trichloroethane MR 29 1996
Carbon tetrachloride MR 29 1996
Trichloroethylene MR 29 1996
Tetrachloroethylene MR 29 1996
Styrene MR 29 1996
cis-1,2-Dichloroethylene MR 29 1996
Consumer Confidence Rule Other 20 2024
Nitrate MR 15 1996
Coliform (TCR) MR 12 1992
E. COLI MR 8 2017
Nitrite MR 7 1996
Lead and Copper Rule MR 7 1996
BHC-GAMMA MR 7 1996
Glyphosate MR 7 1996

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Errol Water Works/West.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID NH0781010 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

New Hampshire Drinking Water Authority

New Hampshire's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find NH regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 Consumer Confidence Rule Other 20 SDWIS / NH0781010 / 7000
2017 E. COLI MR 8 SDWIS / NH0781010 / 3014
2014 Coliform (TCR) MCL 49 SDWIS / NH0781010 / 3100
2013 Public Notice Other 4 SDWIS / NH0781010 / 7500
2007 Combined Uranium MR 3 SDWIS / NH0781010 / 4006
2003 Gross Alpha, Excl. Radon and U MR 5 SDWIS / NH0781010 / 4000
2003 Combined Radium (-226 and -228) MR 5 SDWIS / NH0781010 / 4010
1996 1,2,4-Trichlorobenzene MR 29 SDWIS / NH0781010 / 2378
1996 Xylenes, Total MR 29 SDWIS / NH0781010 / 2955
1996 1,1-Dichloroethylene MR 29 SDWIS / NH0781010 / 2977
1996 trans-1,2-Dichloroethylene MR 29 SDWIS / NH0781010 / 2979
1996 1,2-Dichloroethane MR 29 SDWIS / NH0781010 / 2980
1996 1,2-Dichloropropane MR 29 SDWIS / NH0781010 / 2983
1996 1,1,2-Trichloroethane MR 29 SDWIS / NH0781010 / 2985
1996 CHLOROBENZENE MR 29 SDWIS / NH0781010 / 2989

How Errol Water Works/West Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Errol Water Works/West New Hampshire avg Federal benchmark
Total violations 973 63.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 51 12.1 Indicates a contaminant exceeded a federal MCL
PFAS detection None 45.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 183 506 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,453 regulated public water systems in New Hampshire.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Errol Water Works/West water safe to drink? ▼
Errol Water Works/West (PWS ID: NH0781010) has 973 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 183 people using Groundwater sources.
How many people does Errol Water Works/West serve? ▼
Errol Water Works/West serves 183 people in Errol, New Hampshire. It is a Local-owned system using Groundwater water sources with 69 service connections.
What type of violations does Errol Water Works/West have? ▼
Errol Water Works/West has 973 total violations: 51 health-based violations (MCL exceedances or treatment failures), 894 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Errol Water Works/West water? ▼
No PFAS testing data is available for Errol Water Works/West under the EPA's UCMR5 monitoring program.
What water source does Errol Water Works/West use? ▼
Errol Water Works/West uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.