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Community Water System · PWS NH1141010

Hillsborough Water Works

Hillsborough, New Hampshire 03244 - drinking water served from surface water sources to 2,000 people, tracked in EPA SDWIS and UCMR5.

2,000
People served
737
EPA violations
354
Health-based
Untested
UCMR5 result

The verdict

EPA records 737 drinking-water violations at Hillsborough Water Works, 48% of them health-based - above the New Hampshire per-system average.

737
Total EPA violations on record
48%
Health-based (MCL / treatment failure)
2,000
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Hillsborough Water Works

Hillsborough Water Works is a local-owned community water system that delivers drinking water to 2,000 residents in Hillsborough, New Hampshire (Hillsborough County) through 907 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 737 total violations for this system , of which 354 (48%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 376 monitoring and reporting violations are on file. The most recent violation on record dates to 2018.

The most frequently cited contaminant at this system is TTHM, recorded in 187 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%).

Hillsborough Water Works's 737 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
2,000
Total Violations
737
Health-Based Violations
354
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
907
County
Hillsborough
School/Daycare
No
MCL Violations
353
Monitoring Violations
376
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 187 2014
Total Haloacetic Acids (HAA5) MCL 144 2014
Coliform (TCR) MCL 22 2008
Nitrate MR 8 1994
Coliform (TCR) MR 7 2005
cis-1,2-Dichloroethylene MR 7 1996
Xylenes, Total MR 7 1996
Chromium MR 7 1996
CYANIDE MR 7 1996
o-Dichlorobenzene MR 7 1996
Fluoride MR 7 1996
p-Dichlorobenzene MR 7 1996
Mercury MR 7 1996
Vinyl chloride MR 7 1996
1,1-Dichloroethylene MR 7 1996
Selenium MR 7 1996
trans-1,2-Dichloroethylene MR 7 1996
1,1,1-Trichloroethane MR 7 1996
Carbon tetrachloride MR 7 1996
1,2-Dichloropropane MR 7 1996
Trichloroethylene MR 7 1996
1,1,2-Trichloroethane MR 7 1996
CHLOROBENZENE MR 7 1996
Toluene MR 7 1996
Ethylbenzene MR 7 1996
Styrene MR 7 1996
Arsenic MR 7 1996
1,2,4-Trichlorobenzene MR 7 1996
Barium MR 7 1996
Thallium, Total 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 Hillsborough Water Works.

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 NH1141010 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
2018 TTHM MR 2 SDWIS / NH1141010 / 2950
2018 Total Haloacetic Acids (HAA5) MR 2 SDWIS / NH1141010 / 2456
2014 TTHM MCL 187 SDWIS / NH1141010 / 2950
2014 Total Haloacetic Acids (HAA5) MCL 144 SDWIS / NH1141010 / 2456
2008 Coliform (TCR) MCL 22 SDWIS / NH1141010 / 3100
2005 Coliform (TCR) MR 7 SDWIS / NH1141010 / 3100
1996 cis-1,2-Dichloroethylene MR 7 SDWIS / NH1141010 / 2380
1996 Xylenes, Total MR 7 SDWIS / NH1141010 / 2955
1996 Chromium MR 7 SDWIS / NH1141010 / 1020
1996 CYANIDE MR 7 SDWIS / NH1141010 / 1024
1996 o-Dichlorobenzene MR 7 SDWIS / NH1141010 / 2968
1996 Fluoride MR 7 SDWIS / NH1141010 / 1025
1996 p-Dichlorobenzene MR 7 SDWIS / NH1141010 / 2969
1996 Mercury MR 7 SDWIS / NH1141010 / 1035
1996 Vinyl chloride MR 7 SDWIS / NH1141010 / 2976

How Hillsborough Water Works Compares

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

Metric Hillsborough Water Works New Hampshire avg Federal benchmark
Total violations 737 63.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 354 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 2,000 506 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 Hillsborough Water Works water safe to drink? ▼
Hillsborough Water Works (PWS ID: NH1141010) has 737 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 2,000 people using Surface Water sources.
How many people does Hillsborough Water Works serve? ▼
Hillsborough Water Works serves 2,000 people in Hillsborough, New Hampshire. It is a Local-owned system using Surface Water water sources with 907 service connections.
What type of violations does Hillsborough Water Works have? ▼
Hillsborough Water Works has 737 total violations: 354 health-based violations (MCL exceedances or treatment failures), 376 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Hillsborough Water Works water? ▼
No PFAS testing data is available for Hillsborough Water Works under the EPA's UCMR5 monitoring program.
What water source does Hillsborough Water Works use? ▼
Hillsborough Water Works uses Surface Water 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.