Is La Crosse Waterworks Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: La Crosse

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
TT	Health-based	Resolved	2013-03-16
TT	Health-based	Resolved	2013-03-16
TT	Health-based	Resolved	2013-03-16
TT	Health-based	Resolved	2013-03-16
TT	Health-based	Resolved	2013-03-16
TT	Health-based	Resolved	2013-03-16
TT	Health-based	Resolved	2013-03-16
TT	Health-based	Resolved	2013-03-16
MCL	Health-based	Resolved	2006-03-01 → 2006-03-31
MCL	Health-based	Resolved	2006-03-01 → 2006-03-31

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
Nitrate	4888 µg/L 49% of the EPA limit 10000 µg/L worst single sample: 5200 µg/L	222/244	SYR4	2012–2019
Fluoride	1043 µg/L 26% of the EPA limit 4000 µg/L worst single sample: 1770 µg/L	115/219	SYR4	2012–2019
Chloroform	9.29 µg/L No EPA limit set worst single sample: 18.9 µg/L	81/165	SYR4	2012–2019
Trichloroethylene	1.0675 µg/L 21% of the EPA limit 5 µg/L worst single sample: 1.65 µg/L	66/147	SYR4	2012–2019
Copper	752.2 µg/L 58% of the EPA limit 1300 µg/L worst single sample: 1220 µg/L	57/60	SYR4	2014–2017
Tetrachloroethylene	1.551 µg/L 31% of the EPA limit 5 µg/L worst single sample: 1.77 µg/L	55/147	SYR4	2012–2019
Bromodichloromethane	7.89 µg/L No EPA limit set worst single sample: 11.3 µg/L	53/165	SYR4	2012–2019
Barium	116.8 µg/L 5.8% of the EPA limit 2000 µg/L worst single sample: 128 µg/L	27/27	SYR4	2014–2017
Nitrate-Nitrite	4520 µg/L 45% of the EPA limit 10000 µg/L worst single sample: 5150 µg/L	25/27	SYR4	2014–2017
Lead	6.656 µg/L 44% of the EPA limit 15 µg/L worst single sample: 13.2 µg/L	22/60	SYR4	2014–2017
Dibromochloromethane	10.735 µg/L No EPA limit set worst single sample: 11.4 µg/L	20/165	SYR4	2012–2019
Lead	0.0109 mg/L 73% of the EPA limit 0.0150 mg/L	18/18	LCR	2025
TTHM	29.325 µg/L 37% of the EPA limit 80 µg/L worst single sample: 31.28 µg/L	18/18	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	22.0841 µg/L 37% of the EPA limit 60 µg/L worst single sample: 28.25 µg/L	18/18	SYR4	2012–2019
Monochloroacetic Acid	19.4 µg/L No EPA limit set worst single sample: 26.9 µg/L	16/18	SYR4	2012–2019
Combined Radium (-226 And -228)	2.082 pCi/L 42% of the EPA limit 5 pCi/L worst single sample: 2.55 pCi/L	14/14	SYR4	2014–2017
Trichloroacetic Acid	2.3785 µg/L No EPA limit set worst single sample: 2.58 µg/L	14/18	SYR4	2012–2019
Gross Alpha, Excl. Radon And U	4.72 pCi/L 31% of the EPA limit 15 pCi/L worst single sample: 7 pCi/L	13/13	SYR4	2014
Bromoform	3.979 µg/L No EPA limit set worst single sample: 4.78 µg/L	10/165	SYR4	2012–2019
Selenium	1.6 µg/L 3.2% of the EPA limit 50 µg/L worst single sample: 2 µg/L	9/27	SYR4	2014–2017
Dibromoacetic Acid	1.94 µg/L No EPA limit set worst single sample: 2.12 µg/L	6/18	SYR4	2012–2019
Dichloroacetic Acid	1.98 µg/L No EPA limit set worst single sample: 2.04 µg/L	6/18	SYR4	2012–2019
Arsenic	3.85 µg/L 39% of the EPA limit 10 µg/L worst single sample: 4 µg/L	4/26	SYR4	2014–2017
1,1-Dichloroethylene	0.4537 µg/L 6.5% of the EPA limit 7 µg/L worst single sample: 0.4770 µg/L	3/147	SYR4	2012–2019
1,1,2-Trichloroethane	0.1950 µg/L 3.9% of the EPA limit 5 µg/L	1/147	SYR4	2012–2019
Combined Uranium	0.5900 µg/L 2% of the EPA limit 30 µg/L	1/1	SYR4	2017
cis-1,2-Dichloroethylene	0.4530 µg/L 0.6% of the EPA limit 70 µg/L	1/147	SYR4	2012–2019

47 contaminants tested, none detected

1,1,1-Trichloroethane1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNitriteOxamylPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneToxapheneVinyl ChlorideXylenes, TotalO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Frequently asked questions about La Crosse Waterworks

Is La Crosse Waterworks tap water safe to drink?

EPA monitoring detected 27 contaminants in La Crosse 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 La Crosse Waterworks's water?

EPA monitoring detected Nitrate, Fluoride, Chloroform, Trichloroethylene, Copper, and others. The full list with the level and data source for each is above.

How many people does La Crosse Waterworks serve?

La Crosse Waterworks reports serving 53,000 people, per its EPA record.

Has La Crosse Waterworks had any water quality violations?

The EPA has 69 violations on file for La Crosse Waterworks, of which 12 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.