Is St Johns Northwestern Academies Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Private
Counties served: Waukesha

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

225

violations on file

still open

Violation	Type	Status	Period
TT	Health-based	Resolved	2024-10-17
TT	Health-based	Resolved	2021-12-02
TT	Health-based	Resolved	2021-12-02
MCL	Health-based	Resolved	2001-05-01 → 2001-05-31
MCL	Health-based	Resolved	2001-05-01 → 2001-05-31
MCL	Health-based	Resolved	2001-05-01 → 2001-05-31
MCL	Health-based	Resolved	2001-05-01 → 2001-05-31
MCL	Health-based	Resolved	1999-01-01 → 1999-01-31
MCL	Health-based	Resolved	1999-01-01 → 1999-01-31
MCL	Health-based	Resolved	1999-01-01 → 1999-01-31

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
Lead	18.76 µg/L 125% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 146 µg/L	24/45	SYR4	2012–2019
Copper	589 µg/L 45% of the EPA limit 1300 µg/L worst single sample: 1660 µg/L	23/47	SYR4	2012–2019
Lead	0.0088 mg/L 59% of the EPA limit 0.0150 mg/L	22/22	LCR	2024
Barium	137.5 µg/L 6.9% of the EPA limit 2000 µg/L worst single sample: 140 µg/L	6/6	SYR4	2012–2018
Fluoride	200 µg/L 5% of the EPA limit 4000 µg/L	6/6	SYR4	2012–2018
Bromodichloromethane	1.76 µg/L No EPA limit set worst single sample: 1.9 µg/L	5/9	SYR4	2012–2019
Chloroform	3.44 µg/L No EPA limit set worst single sample: 3.5 µg/L	5/14	SYR4	2012–2019
TTHM	4.548 µg/L 5.7% of the EPA limit 80 µg/L worst single sample: 4.81 µg/L	5/6	SYR4	2012–2019
Dibromochloromethane	1.11 µg/L No EPA limit set worst single sample: 1.2 µg/L	4/11	SYR4	2012–2019
Nitrate	430 µg/L 4.3% of the EPA limit 10000 µg/L	4/16	SYR4	2013–2019
Dichloroacetic Acid	2.84 µg/L No EPA limit set worst single sample: 2.9 µg/L	3/6	SYR4	2012–2019
Nitrate-Nitrite	460.6 µg/L 4.6% of the EPA limit 10000 µg/L worst single sample: 474 µg/L	3/8	SYR4	2012–2018
Toluene	1.69 µg/L 0.2% of the EPA limit 1000 µg/L worst single sample: 1.8 µg/L	3/18	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	5.913 µg/L 9.9% of the EPA limit 60 µg/L worst single sample: 6.06 µg/L	3/6	SYR4	2012–2019
Arsenic	4.655 µg/L 47% of the EPA limit 10 µg/L worst single sample: 4.8 µg/L	2/6	SYR4	2012–2018
Chromium	1.49 µg/L 1.5% of the EPA limit 100 µg/L worst single sample: 1.5 µg/L	2/6	SYR4	2012–2018
Combined Radium (-226 And -228)	3.538 pCi/L 71% of the EPA limit 5 pCi/L worst single sample: 3.6 pCi/L	2/2	SYR4	2015
Dibromoacetic Acid	0.5515 µg/L No EPA limit set worst single sample: 0.5600 µg/L	2/6	SYR4	2012–2019
Gross Alpha, Excl. Radon And U	3.49 pCi/L 23% of the EPA limit 15 pCi/L worst single sample: 3.6 pCi/L	2/2	SYR4	2015
Nitrite	135 µg/L 14% of the EPA limit 1000 µg/L worst single sample: 140 µg/L	2/6	SYR4	2012–2018
Trichloroacetic Acid	2.565 µg/L No EPA limit set worst single sample: 2.6 µg/L	2/6	SYR4	2012–2019
Bromoform	0.2000 µg/L No EPA limit set	1/10	SYR4	2012–2019
Cadmium	0.2600 µg/L 5.2% of the EPA limit 5 µg/L	1/6	SYR4	2012–2018

55 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-GammaBenzeneBeryllium, TotalChlorobenzeneCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about St Johns Northwestern Academies

Is St Johns Northwestern Academies tap water safe to drink?

EPA monitoring detected 23 contaminants in St Johns Northwestern Academies'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 St Johns Northwestern Academies's water?

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

How many people does St Johns Northwestern Academies serve?

St Johns Northwestern Academies reports serving 340 people in Wisconsin, per its EPA record.

Has St Johns Northwestern Academies had any water quality violations?

The EPA has 225 violations on file for St Johns Northwestern Academies, of which 12 are health-based (a contaminant limit or required treatment was breached) and 2 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.