Is Greendale Waterworks Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: Milwaukee

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	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	2011-09-01 → 2011-09-30
MCL	Health-based	Resolved	2011-09-01 → 2011-09-30
MR	Monitoring	Resolved	2023-10-01 → 2023-12-31
MR	Monitoring	Resolved	2023-10-01 → 2023-12-31
MR	Monitoring	Resolved	2023-10-01 → 2023-12-31
MR	Monitoring	Resolved	2023-10-01 → 2023-12-31

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
Bromodichloromethane	5.61 µg/L No EPA limit set worst single sample: 7.1 µg/L	124/124	SYR4	2012–2019
Dibromochloromethane	3.3 µg/L No EPA limit set worst single sample: 3.6 µg/L	124/124	SYR4	2012–2019
TTHM	15.8555 µg/L 20% of the EPA limit 80 µg/L worst single sample: 20.34 µg/L	124/124	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	5.512 µg/L 9.2% of the EPA limit 60 µg/L worst single sample: 6.49 µg/L	124/124	SYR4	2012–2019
Chloroform	6.84 µg/L No EPA limit set worst single sample: 9.4 µg/L	119/124	SYR4	2012–2019
Dichloroacetic Acid	3.52 µg/L No EPA limit set worst single sample: 4.7 µg/L	99/124	SYR4	2012–2019
Dibromoacetic Acid	0.8300 µg/L No EPA limit set worst single sample: 1.3 µg/L	93/124	SYR4	2012–2019
Trichloroacetic Acid	1.445 µg/L No EPA limit set worst single sample: 2 µg/L	92/124	SYR4	2012–2019
Copper	99.8 µg/L 7.7% of the EPA limit 1300 µg/L worst single sample: 120 µg/L	58/60	SYR4	2014–2017
Lead	1.565 µg/L 10% of the EPA limit 15 µg/L worst single sample: 34 µg/L	40/60	SYR4	2014–2017
Monobromoacetic Acid	0.6060 µg/L No EPA limit set worst single sample: 0.7700 µg/L	28/124	SYR4	2012–2019
Lead	0.00032 mg/L 2.1% of the EPA limit 0.0150 mg/L	15/15	LCR	2023
Bromoform	0.6640 µg/L No EPA limit set worst single sample: 0.6700 µg/L	4/124	SYR4	2012–2019

31 contaminants tested, none detected

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Frequently asked questions about Greendale Waterworks

Is Greendale Waterworks tap water safe to drink?

EPA monitoring detected 13 contaminants in Greendale 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 Greendale Waterworks's water?

EPA monitoring detected Bromodichloromethane, Dibromochloromethane, TTHM, Total Haloacetic Acids (HAA5), Chloroform, and others. The full list with the level and data source for each is above.

How many people does Greendale Waterworks serve?

Greendale Waterworks reports serving 14,393 people in Wisconsin, per its EPA record.

Has Greendale Waterworks had any water quality violations?

The EPA has 18 violations on file for Greendale Waterworks, of which 6 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.