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Tap water quality report

Cogswell Springs Water Works

EPA monitoring tested this supplier for 70 contaminants and detected 7. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

70
contaminants tested
7
detected
3,000
people served
20
health-based violations
New Hampshire rankingsLead in New HampshirePFAS in New Hampshire
Water source
Ground water
Ownership
Local government
Counties served
Merrimack

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.

20
health-based violations
40
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2010-10-01 → 2010-10-31
MCL Health-based Resolved 2010-10-01 → 2010-10-31
MCL Health-based Resolved 2010-10-01 → 2010-10-31
MCL Health-based Resolved 2010-10-01 → 2010-10-31
MCL Health-based Resolved 2008-09-01 → 2008-09-30
MCL Health-based Resolved 2008-09-01 → 2008-09-30
MCL Health-based Resolved 2008-09-01 → 2008-09-30
MCL Health-based Resolved 2008-09-01 → 2008-09-30
MCL Health-based Resolved 2004-10-01 → 2004-10-31
MCL Health-based Resolved 2004-10-01 → 2004-10-31

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
194 µg/L 15%
of the EPA limit 1300 µg/L
worst single sample: 340 µg/L
25/25 SYR4 2015–2019
Lead
30.8 µg/L 205%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 53 µg/L
13/20 SYR4 2016–2019
Barium
39.6 µg/L 2%
of the EPA limit 2000 µg/L
worst single sample: 45 µg/L
5/5 SYR4 2015–2018
Combined Radium (-226 And -228)
0.4900 pCi/L 9.8%
of the EPA limit 5 pCi/L
worst single sample: 0.5000 pCi/L
2/2 SYR4 2014
Combined Uranium
0.5950 µg/L 2%
of the EPA limit 30 µg/L
worst single sample: 0.6000 µg/L
2/3 SYR4 2014–2017
Gross Alpha, Excl. Radon And U
6.175 pCi/L 41%
of the EPA limit 15 pCi/L
worst single sample: 6.3 pCi/L
2/2 SYR4 2014–2017
Lead
0.0190 mg/L 127%
above the EPA limit of 0.0150 mg/L
 1/1 LCR 1993
63 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, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebDiquatEthylene DibromideEndrinEthylbenzeneFluorideGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitrateNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DIANE KENDALL

Frequently asked questions about Cogswell Springs Water Works

Is Cogswell Springs Water Works tap water safe to drink?

EPA monitoring detected 7 contaminants in Cogswell Springs 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 Cogswell Springs Water Works's water?

EPA monitoring detected Copper, Lead, Barium, Combined Radium (-226 And -228), Combined Uranium, and others. The full list with the level and data source for each is above.

How many people does Cogswell Springs Water Works serve?

Cogswell Springs Water Works reports serving 3,000 people in New Hampshire, per its EPA record.

Has Cogswell Springs Water Works had any water quality violations?

The EPA has 40 violations on file for Cogswell Springs Water Works, of which 20 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.