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Tap water quality report

Hidden Valley/Mason

EPA monitoring tested this supplier for 67 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

67
contaminants tested
10
detected
298
people served
15
health-based violations
New Hampshire rankingsLead in New HampshirePFAS in New Hampshire
Water source
Ground water
Ownership
Private
Counties served
Carroll

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
120
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2016-12-01
TT Health-based Resolved 2016-12-01
TT Health-based Resolved 2016-12-01
TT Health-based Resolved 2016-12-01
MCL Health-based Resolved 2011-09-01 → 2011-09-30
MCL Health-based Resolved 2011-09-01 → 2011-09-30
MCL Health-based Resolved 2011-09-01 → 2011-09-30
MCL Health-based Resolved 2011-09-01 → 2011-09-30
MCL Health-based Resolved 2010-12-01 → 2010-12-31
MCL Health-based Resolved 2010-12-01 → 2010-12-31

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
101.3 µg/L 7.8%
of the EPA limit 1300 µg/L
worst single sample: 130 µg/L
15/15 SYR4 2014–2018
Fluoride
620 µg/L 16%
of the EPA limit 4000 µg/L
worst single sample: 680 µg/L
5/5 SYR4 2014–2017
Arsenic
2.85 µg/L 29%
of the EPA limit 10 µg/L
worst single sample: 3 µg/L
4/5 SYR4 2014–2017
Barium
2.85 µg/L 0.1%
of the EPA limit 2000 µg/L
worst single sample: 3 µg/L
4/5 SYR4 2014–2017
Combined Radium (-226 And -228)
0.9400 pCi/L 19%
of the EPA limit 5 pCi/L
worst single sample: 1 pCi/L
4/4 SYR4 2015–2016
Combined Uranium
2.395 µg/L 8%
of the EPA limit 30 µg/L
worst single sample: 2.5 µg/L
4/4 SYR4 2015–2016
Gross Alpha, Excl. Radon And U
2.955 pCi/L 20%
of the EPA limit 15 pCi/L
worst single sample: 3 pCi/L
4/4 SYR4 2015–2016
Lead
12.39 µg/L 83%
of the EPA limit 15 µg/L
worst single sample: 13 µg/L
3/10 SYR4 2015–2018
Nitrate
500 µg/L 5%
of the EPA limit 10000 µg/L
 2/34 SYR4 2014–2019
Chromium
1 µg/L 1%
of the EPA limit 100 µg/L
 1/5 SYR4 2014–2017
57 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, TotalBromodichloromethaneBromoformChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformDichloromethaneDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDinosebEthylene DibromideEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
THOMAS MASON JR

Frequently asked questions about Hidden Valley/Mason

Is Hidden Valley/Mason tap water safe to drink?

EPA monitoring detected 10 contaminants in Hidden Valley/Mason'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 Hidden Valley/Mason's water?

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

How many people does Hidden Valley/Mason serve?

Hidden Valley/Mason reports serving 298 people in New Hampshire, per its EPA record.

Has Hidden Valley/Mason had any water quality violations?

The EPA has 120 violations on file for Hidden Valley/Mason, 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.