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Community Water System · PWS NH1731010

Newmarket Water Works

Newmarket, New Hampshire 03857 - drinking water served from groundwater sources to 5,030 people, tracked in EPA SDWIS and UCMR5.

5,030
People served
251
EPA violations
17
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 251 drinking-water violations at Newmarket Water Works, 7% of them health-based - above the New Hampshire per-system average.

251
Total EPA violations on record
7%
Health-based (MCL / treatment failure)
5,030
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Newmarket Water Works

Newmarket Water Works is a local-owned community water system that delivers drinking water to 5,030 residents in Newmarket, New Hampshire (Rockingham County) through 1,951 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 251 total violations for this system , of which 17 (7%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 229 monitoring and reporting violations are on file. The most recent violation on record dates to 2017.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 11 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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%).

Newmarket Water Works's 251 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
5,030
Total Violations
251
Health-Based Violations
17
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
1,951
County
Rockingham
School/Daycare
No
MCL Violations
11
Monitoring Violations
229
Treatment Tech Violations
6

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 11 1997
cis-1,2-Dichloroethylene MR 9 2007
Xylenes, Total MR 9 2007
DICHLOROMETHANE MR 9 2007
o-Dichlorobenzene MR 9 2007
p-Dichlorobenzene MR 9 2007
Vinyl chloride MR 9 2007
1,2-Dichloroethane MR 9 2007
Trichloroethylene MR 9 2007
1,1,2-Trichloroethane MR 9 2007
CHLOROBENZENE MR 9 2007
Benzene MR 9 2007
Toluene MR 9 2007
Ethylbenzene MR 9 2007
Styrene MR 9 2007
Carbon tetrachloride MR 9 2007
1,2-Dichloropropane MR 9 2007
Tetrachloroethylene MR 9 2007
1,1-Dichloroethylene MR 9 2007
trans-1,2-Dichloroethylene MR 9 2007
1,1,1-Trichloroethane MR 9 2007
1,2,4-Trichlorobenzene MR 9 2007
Surface Water Treatment Rule TT 6 1997
Nitrate MR 5 2007
Gross Alpha, Excl. Radon and U MR 4 2001
Combined Radium (-226 and -228) MR 4 2001
Nitrite MR 3 2005
Arsenic MR 2 2005
Cadmium MR 2 2005
CYANIDE MR 2 2005

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 116 samples detected PFAS.

Contaminant Date Result MRL Status
PFPeS 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
6:2 FTS 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 4/3/2023 <20.00 ppt 20.00 ppt Not Detected
ADONA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFEESA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 4/3/2023 <7.00 ppt 7.00 ppt Not Detected
PFBA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 4/3/2023 <2.00 ppt 2.00 ppt Not Detected
NEtFOSAA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 4/3/2023 <2.00 ppt 2.00 ppt Not Detected
PFOS 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
NMeFOSAA 4/3/2023 <6.00 ppt 6.00 ppt Not Detected
PFTA 4/3/2023 <8.00 ppt 8.00 ppt Not Detected
11Cl-PF3OUdS 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFDoA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 4/3/2023 <2.00 ppt 2.00 ppt Not Detected
PFMPA 4/3/2023 <4.00 ppt 4.00 ppt Not Detected
9Cl-PF3ONS 4/3/2023 <2.00 ppt 2.00 ppt Not Detected
PFDA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 4/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFEESA 4/3/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 4/3/2023 <20.00 ppt 20.00 ppt Not Detected

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 Newmarket 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 NH1731010 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
2017 Chlorine MR 2 SDWIS / NH1731010 / 0999
2007 cis-1,2-Dichloroethylene MR 9 SDWIS / NH1731010 / 2380
2007 Xylenes, Total MR 9 SDWIS / NH1731010 / 2955
2007 DICHLOROMETHANE MR 9 SDWIS / NH1731010 / 2964
2007 o-Dichlorobenzene MR 9 SDWIS / NH1731010 / 2968
2007 p-Dichlorobenzene MR 9 SDWIS / NH1731010 / 2969
2007 Vinyl chloride MR 9 SDWIS / NH1731010 / 2976
2007 1,2-Dichloroethane MR 9 SDWIS / NH1731010 / 2980
2007 Trichloroethylene MR 9 SDWIS / NH1731010 / 2984
2007 1,1,2-Trichloroethane MR 9 SDWIS / NH1731010 / 2985
2007 CHLOROBENZENE MR 9 SDWIS / NH1731010 / 2989
2007 Benzene MR 9 SDWIS / NH1731010 / 2990
2007 Toluene MR 9 SDWIS / NH1731010 / 2991
2007 Ethylbenzene MR 9 SDWIS / NH1731010 / 2992
2007 Styrene MR 9 SDWIS / NH1731010 / 2996

How Newmarket Water Works Compares

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

Metric Newmarket Water Works New Hampshire avg Federal benchmark
Total violations 251 63.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 17 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 5,030 506 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 Newmarket Water Works water safe to drink? ▼
Newmarket Water Works (PWS ID: NH1731010) has 251 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 5,030 people using Groundwater sources.
How many people does Newmarket Water Works serve? ▼
Newmarket Water Works serves 5,030 people in Newmarket, New Hampshire. It is a Local-owned system using Groundwater water sources with 1,951 service connections.
What type of violations does Newmarket Water Works have? ▼
Newmarket Water Works has 251 total violations: 17 health-based violations (MCL exceedances or treatment failures), 229 monitoring/reporting violations, and 6 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Newmarket Water Works water? ▼
No. Newmarket Water Works was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Newmarket Water Works use? ▼
Newmarket Water Works 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). 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.