Is Granton Waterworks Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Clark

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	2025-01-01 → 2025-03-31
MCL	Health-based	Archived	2025-01-01 → 2025-03-31
MCL	Health-based	Archived	2025-01-01 → 2025-03-31
MCL	Health-based	Resolved	2014-07-01 → 2014-09-30
MCL	Health-based	Resolved	2014-07-01 → 2014-09-30
MCL	Health-based	Resolved	2014-07-01 → 2014-09-30
MCL	Health-based	Resolved	2014-07-01 → 2014-09-30
MCL	Health-based	Resolved	2014-07-01 → 2014-09-30
MCL	Health-based	Resolved	2001-04-01 → 2001-06-30
MCL	Health-based	Resolved	2001-04-01 → 2001-06-30

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	594 µg/L 46% of the EPA limit 1300 µg/L worst single sample: 770 µg/L	37/37	SYR4	2014–2017
Lead	17.8 µg/L 119% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 43 µg/L	37/37	SYR4	2014–2017
Bromodichloromethane	19.4 µg/L No EPA limit set worst single sample: 27 µg/L	29/34	SYR4	2012–2019
Bromoform	15.4 µg/L No EPA limit set worst single sample: 17 µg/L	29/33	SYR4	2012–2019
Chloroform	9.12 µg/L No EPA limit set worst single sample: 12 µg/L	29/37	SYR4	2012–2019
Dibromochloromethane	28 µg/L No EPA limit set worst single sample: 36 µg/L	29/36	SYR4	2012–2019
TTHM	68.965 µg/L 86% of the EPA limit 80 µg/L worst single sample: 88 µg/L	22/22	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	16.53 µg/L 28% of the EPA limit 60 µg/L worst single sample: 19.5 µg/L	21/21	SYR4	2012–2019
Dibromoacetic Acid	7.49 µg/L No EPA limit set worst single sample: 9.2 µg/L	20/21	SYR4	2012–2019
Lead	0.0022 mg/L 15% of the EPA limit 0.0150 mg/L	17/17	LCR	2023
Trichloroacetic Acid	2.38 µg/L No EPA limit set worst single sample: 2.7 µg/L	17/21	SYR4	2012–2019
Ethylene Dibromide	0.5692 µg/L 1138% of the EPA limit, at the 95th percentile of samples — 0.0500 µg/L worst single sample: 1.3 µg/L	13/35	SYR4	2012–2019
Nitrate	4300 µg/L 43% of the EPA limit 10000 µg/L	12/24	SYR4	2012–2019
Dichloroacetic Acid	5.06 µg/L No EPA limit set worst single sample: 5.3 µg/L	9/21	SYR4	2012–2019
Barium	36.4 µg/L 1.8% of the EPA limit 2000 µg/L worst single sample: 37 µg/L	4/4	SYR4	2014–2017
Fluoride	228.5 µg/L 5.7% of the EPA limit 4000 µg/L worst single sample: 230 µg/L	4/4	SYR4	2014–2017
Monobromoacetic Acid	1.685 µg/L No EPA limit set worst single sample: 1.7 µg/L	4/21	SYR4	2012–2019
Nitrate-Nitrite	3360 µg/L 34% of the EPA limit 10000 µg/L worst single sample: 3400 µg/L	3/4	SYR4	2014–2017
Chromium	1.575 µg/L 1.6% of the EPA limit 100 µg/L worst single sample: 1.6 µg/L	2/4	SYR4	2014–2017
Combined Radium (-226 And -228)	1.495 pCi/L 30% of the EPA limit 5 pCi/L worst single sample: 1.5 pCi/L	2/2	SYR4	2014
Lasso	0.0900 µg/L 4.5% of the EPA limit 2 µg/L	1/3	SYR4	2014–2017

54 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-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneMercuryMethoxychlorMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

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Frequently asked questions about Granton Waterworks

Is Granton Waterworks tap water safe to drink?

EPA monitoring detected 21 contaminants in Granton Waterworks'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 Granton Waterworks's water?

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

How many people does Granton Waterworks serve?

Granton Waterworks reports serving 349 people in Wisconsin, per its EPA record.

Has Granton Waterworks had any water quality violations?

The EPA has 86 violations on file for Granton Waterworks, of which 29 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.