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Tap water quality report

Pennichuck Water Works

EPA monitoring tested this supplier for 107 contaminants and detected 15. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

107
contaminants tested
15
detected
88,853
people served
3
health-based violations
New Hampshire rankingsLead in New HampshirePFAS in New Hampshire
Water source
Surface water
Ownership
Private
Counties served
Hillsborough

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

3
health-based violations
5
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2002-08-01 → 2002-08-31
TT Health-based Resolved 2002-08-01 → 2002-08-31
TT Health-based Resolved 2002-08-01 → 2002-08-31
MR Monitoring Resolved 2008-10-01
MR Monitoring Resolved 2008-10-01

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
15 µg/L
No EPA limit set
worst single sample: 17 µg/L
187/193 SYR4 2014–2019
Chloroform
41 µg/L
No EPA limit set
worst single sample: 52 µg/L
187/193 SYR4 2014–2019
Dibromochloromethane
5.27 µg/L
No EPA limit set
worst single sample: 6.6 µg/L
187/193 SYR4 2014–2019
TTHM
61.75 µg/L 77%
of the EPA limit 80 µg/L
worst single sample: 72 µg/L
186/192 SYR4 2014–2019
Total Haloacetic Acids (HAA5)
21.8 µg/L 36%
of the EPA limit 60 µg/L
worst single sample: 30 µg/L
181/183 SYR4 2014–2019
Dichloroacetic Acid
12 µg/L
No EPA limit set
worst single sample: 17 µg/L
169/177 SYR4 2014–2019
Trichloroacetic Acid
9.9844 µg/L
No EPA limit set
worst single sample: 13 µg/L
167/176 SYR4 2014–2019
Copper
96.06 µg/L 7.4%
of the EPA limit 1300 µg/L
worst single sample: 274.882 µg/L
65/66 SYR4 2014–2019
Dibromoacetic Acid
1.96113 µg/L
No EPA limit set
worst single sample: 2.2 µg/L
52/177 SYR4 2014–2019
Bromoform
0.9450 µg/L
No EPA limit set
worst single sample: 1.2 µg/L
32/193 SYR4 2014–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2023
Nitrate
680 µg/L 6.8%
of the EPA limit 10000 µg/L
 12/24 SYR4 2014–2019
Lead
59.538 µg/L 397%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 82.8013 µg/L
8/62 SYR4 2014–2017
Barium
12.2273 µg/L 0.6%
of the EPA limit 2000 µg/L
worst single sample: 12.3 µg/L
2/4 SYR4 2015–2019
Combined Radium (-226 And -228)
0.5000 pCi/L 10%
of the EPA limit 5 pCi/L
 1/2 SYR4 2015–2016
92 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndrinEthylbenzeneFluorideGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
LESLIE MORGAN

Frequently asked questions about Pennichuck Water Works

Is Pennichuck Water Works tap water safe to drink?

EPA monitoring detected 15 contaminants in Pennichuck Water Works's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Pennichuck Water Works's water?

EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Pennichuck Water Works serve?

Pennichuck Water Works reports serving 88,853 people in New Hampshire, per its EPA record.

Has Pennichuck Water Works had any water quality violations?

The EPA has 5 violations on file for Pennichuck Water Works, of which 3 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.