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Tap water quality report

Cornerstone Place

EPA monitoring tested this supplier for 69 contaminants and detected 8. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

69
contaminants tested
8
detected
20
people served
33
health-based violations
New Hampshire rankingsLead in New HampshirePFAS in New Hampshire
Water source
Ground water
Ownership
Private
Counties served
Rockingham

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.

33
health-based violations
109
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2025-07-01 → 2025-09-30
MCL Health-based Archived 2025-07-01 → 2025-09-30
MCL Health-based Archived 2025-07-01 → 2025-09-30
TT Health-based Resolved 2016-01-10
TT Health-based Resolved 2016-01-10
TT Health-based Resolved 2016-01-10
TT Health-based Resolved 2016-01-10
TT Health-based Resolved 2015-11-13
TT Health-based Resolved 2015-11-13
TT Health-based Resolved 2015-11-13

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
67.395 µg/L 5.2%
of the EPA limit 1300 µg/L
worst single sample: 77.9 µg/L
12/12 SYR4 2014–2019
Nitrate
1870 µg/L 19%
of the EPA limit 10000 µg/L
 12/12 SYR4 2014–2019
Combined Uranium
140.395 µg/L 468%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
worst single sample: 207 µg/L
8/19 SYR4 2014–2019
Lead
5.24 µg/L 35%
of the EPA limit 15 µg/L
worst single sample: 6.2 µg/L
7/10 SYR4 2015–2019
Combined Radium (-226 And -228)
2.315 pCi/L 46%
of the EPA limit 5 pCi/L
worst single sample: 2.4 pCi/L
2/4 SYR4 2014–2016
Gross Alpha, Excl. Radon And U
1.395 pCi/L 9.3%
of the EPA limit 15 pCi/L
worst single sample: 1.4 pCi/L
2/5 SYR4 2014–2016
Barium
5.8 µg/L 0.3%
of the EPA limit 2000 µg/L
 1/2 SYR4 2014–2017
Fluoride
210 µg/L 5.3%
of the EPA limit 4000 µg/L
 1/2 SYR4 2014–2017
61 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) PhthalateDibromochloromethaneDinosebEthylene DibromideEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ROBERT SULLIVAN

Frequently asked questions about Cornerstone Place

Is Cornerstone Place tap water safe to drink?

EPA monitoring detected 8 contaminants in Cornerstone Place'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 Cornerstone Place's water?

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

How many people does Cornerstone Place serve?

Cornerstone Place reports serving 20 people in New Hampshire, per its EPA record.

Has Cornerstone Place had any water quality violations?

The EPA has 109 violations on file for Cornerstone Place, of which 33 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.