Is Emerald Lake Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
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.

129

health-based violations

179

violations on file

still open

Violation	Type	Status	Period
TT	Health-based	Unaddressed	2020-10-02
TT	Health-based	Unaddressed	2020-10-02
TT	Health-based	Unaddressed	2020-10-02
MCL	Health-based	Resolved	2020-01-01 → 2020-03-31
MCL	Health-based	Resolved	2020-01-01 → 2020-03-31
MCL	Health-based	Resolved	2020-01-01 → 2020-03-31
MCL	Health-based	Resolved	2020-01-01 → 2020-03-31
MCL	Health-based	Resolved	2019-10-01 → 2019-12-31
MCL	Health-based	Resolved	2019-10-01 → 2019-12-31
MCL	Health-based	Resolved	2019-10-01 → 2019-12-31

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Copper	480 µg/L 37% of the EPA limit 1300 µg/L worst single sample: 930 µg/L	76/78	SYR4	2014–2019
Arsenic	8.3 µg/L 83% of the EPA limit 10 µg/L worst single sample: 59 µg/L	58/81	SYR4	2014–2019
Fluoride	4250 µg/L 106% of the EPA limit, at the 95th percentile of samples — 4000 µg/L worst single sample: 4400 µg/L	31/31	SYR4	2014–2019
Lead	4.85 µg/L 32% of the EPA limit 15 µg/L worst single sample: 6.2 µg/L	24/70	SYR4	2015–2019
Barium	3.7 µg/L 0.2% of the EPA limit 2000 µg/L worst single sample: 4 µg/L	7/8	SYR4	2014–2019
Bromodichloromethane	1.48 µg/L No EPA limit set worst single sample: 1.6 µg/L	7/32	SYR4	2014–2019
Dibromochloromethane	1.17 µg/L No EPA limit set worst single sample: 1.2 µg/L	7/32	SYR4	2014–2019
TTHM	3.976 µg/L 5% of the EPA limit 80 µg/L worst single sample: 4.18 µg/L	7/12	SYR4	2014–2019
Chloroform	1.438 µg/L No EPA limit set worst single sample: 1.6 µg/L	5/32	SYR4	2014–2019
Combined Radium (-226 And -228)	0.5550 pCi/L 11% of the EPA limit 5 pCi/L worst single sample: 0.6000 pCi/L	4/4	SYR4	2015–2017
Gross Alpha, Excl. Radon And U	1.65 pCi/L 11% of the EPA limit 15 pCi/L worst single sample: 1.8 pCi/L	4/4	SYR4	2015–2017
Combined Uranium	4.11 µg/L 14% of the EPA limit 30 µg/L worst single sample: 4.5 µg/L	3/4	SYR4	2015–2017
Bromoform	0.8000 µg/L No EPA limit set	1/32	SYR4	2014–2019

62 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 TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDichloroacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitrateNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: CAROLYN RENKEN

Frequently asked questions about Emerald Lake

Is Emerald Lake tap water safe to drink?

EPA monitoring detected 13 contaminants in Emerald Lake'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 Emerald Lake's water?

EPA monitoring detected Copper, Arsenic, Fluoride, Lead, Barium, and others. The full list with the level and data source for each is above.

How many people does Emerald Lake serve?

Emerald Lake reports serving 1,300 people in New Hampshire, per its EPA record.

Has Emerald Lake had any water quality violations?

The EPA has 179 violations on file for Emerald Lake, of which 129 are health-based (a contaminant limit or required treatment was breached) and 4 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.