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Tap water quality report

Charlestown Water Works

EPA monitoring tested this supplier for 75 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

75
contaminants tested
17
detected
2,850
people served
15
health-based violations
New Hampshire rankingsLead in New HampshirePFAS in New Hampshire
Water source
Ground water
Ownership
Local government
Counties served
Sullivan

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.

15
health-based violations
37
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1991-10-01 → 1991-10-31
MCL Health-based Resolved 1991-10-01 → 1991-10-31
MCL Health-based Resolved 1991-10-01 → 1991-10-31
MCL Health-based Resolved 1991-10-01 → 1991-10-31
MCL Health-based Resolved 1991-10-01 → 1991-10-31
MCL Health-based Resolved 1991-10-01 → 1991-10-31
MCL Health-based Resolved 1991-10-01 → 1991-10-31
MCL Health-based Resolved 1991-10-01 → 1991-10-31
MCL Health-based Resolved 1991-10-01 → 1991-10-31
MCL Health-based Resolved 1991-01-01 → 1991-01-31

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
Copper
560 µg/L 43%
of the EPA limit 1300 µg/L
worst single sample: 630 µg/L
73/76 SYR4 2015–2019
Lead
7.6 µg/L 51%
of the EPA limit 15 µg/L
worst single sample: 14 µg/L
33/70 SYR4 2015–2019
Nitrate
1395 µg/L 14%
of the EPA limit 10000 µg/L
worst single sample: 1400 µg/L
22/32 SYR4 2014–2019
TTHM
9.195 µg/L 11%
of the EPA limit 80 µg/L
worst single sample: 9.8 µg/L
12/12 SYR4 2014–2019
Bromodichloromethane
2.855 µg/L
No EPA limit set
worst single sample: 2.9 µg/L
10/21 SYR4 2014–2019
Chloroform
6.655 µg/L
No EPA limit set
worst single sample: 6.7 µg/L
10/21 SYR4 2014–2019
Dibromochloromethane
1.5 µg/L
No EPA limit set
 10/21 SYR4 2014–2019
Barium
6.65 µg/L 0.3%
of the EPA limit 2000 µg/L
worst single sample: 7.2 µg/L
6/6 SYR4 2016–2019
Bromoform
1.1 µg/L
No EPA limit set
 6/21 SYR4 2014–2019
Combined Uranium
0.7000 µg/L 2.3%
of the EPA limit 30 µg/L
 6/7 SYR4 2016–2017
Dichloroacetic Acid
5 µg/L
No EPA limit set
 6/12 SYR4 2014–2019
Total Haloacetic Acids (HAA5)
9.375 µg/L 16%
of the EPA limit 60 µg/L
worst single sample: 9.4 µg/L
6/12 SYR4 2014–2019
Trichloroacetic Acid
4.375 µg/L
No EPA limit set
worst single sample: 4.4 µg/L
6/12 SYR4 2014–2019
Combined Radium (-226 And -228)
1.03 pCi/L 21%
of the EPA limit 5 pCi/L
worst single sample: 1.1 pCi/L
3/6 SYR4 2016–2017
Arsenic
1.095 µg/L 11%
of the EPA limit 10 µg/L
worst single sample: 1.1 µg/L
2/6 SYR4 2016–2019
Gross Alpha, Excl. Radon And U
0.4800 pCi/L 3.2%
of the EPA limit 15 pCi/L
worst single sample: 0.5000 pCi/L
2/7 SYR4 2016–2017
Lead
0.0190 mg/L 127%
above the EPA limit of 0.0150 mg/L
 1/1 LCR 2024
58 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneFluorideGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
PATRICIA CHAFFEE

Frequently asked questions about Charlestown Water Works

Is Charlestown Water Works tap water safe to drink?

EPA monitoring detected 17 contaminants in Charlestown 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 Charlestown Water Works's water?

EPA monitoring detected Copper, Lead, Nitrate, TTHM, Bromodichloromethane, and others. The full list with the level and data source for each is above.

How many people does Charlestown Water Works serve?

Charlestown Water Works reports serving 2,850 people in New Hampshire, per its EPA record.

Has Charlestown Water Works had any water quality violations?

The EPA has 37 violations on file for Charlestown Water Works, of which 15 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.