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Tap water quality report

Monona Waterworks

EPA monitoring tested this supplier for 106 contaminants and detected 26. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

106
contaminants tested
26
detected
8,624
people served
1
health-based violations
Wisconsin rankingsLead in WisconsinPFAS in Wisconsin
Water source
Ground water
Ownership
Local government
Counties served
Dane

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.

1
health-based violations
15
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1991-06-11 → 1991-07-10
MR Monitoring Resolved 2007-09-01 → 2007-09-30
MR Monitoring Resolved 2007-09-01 → 2007-09-30
MR Monitoring Resolved 2007-09-01 → 2007-09-30
MR Monitoring Resolved 2007-09-01 → 2007-09-30
MR Monitoring Resolved 2007-09-01 → 2007-09-30
MR Monitoring Resolved 2007-07-01 → 2007-09-30
MR Monitoring Resolved 2007-07-01 → 2007-09-30
MR Monitoring Resolved 2007-07-01 → 2007-09-30
MR Monitoring Resolved 2007-07-01 → 2007-09-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0110 µg/L 2/3 2025
PFBS 0.0053 µg/L 2/3 2025
PFHXS 0.0054 µg/L 2/3 2025
Pfhxa 0.0042 µg/L 1/3 2025
Pfpea 0.0046 µg/L 1/3 2025

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Fluoride
1052 µg/L 26%
of the EPA limit 4000 µg/L
worst single sample: 1190 µg/L
99/198 SYR4 2012–2019
Copper
283.3 µg/L 22%
of the EPA limit 1300 µg/L
worst single sample: 721 µg/L
40/40 SYR4 2014–2017
Dibromochloromethane
4.27 µg/L
No EPA limit set
worst single sample: 5.8 µg/L
18/28 SYR4 2012–2019
Nitrate-Nitrite
4265 µg/L 43%
of the EPA limit 10000 µg/L
worst single sample: 4490 µg/L
16/24 SYR4 2012–2019
Lead
0.0028 mg/L 19%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2023
Bromodichloromethane
4.46 µg/L
No EPA limit set
worst single sample: 5.5 µg/L
14/28 SYR4 2012–2019
Bromoform
2.3 µg/L
No EPA limit set
worst single sample: 2.4 µg/L
11/28 SYR4 2012–2019
Chloroform
3.96 µg/L
No EPA limit set
worst single sample: 4.1 µg/L
8/28 SYR4 2012–2019
Nitrate
4490 µg/L 45%
of the EPA limit 10000 µg/L
 8/12 SYR4 2014–2017
TTHM
15.223 µg/L 19%
of the EPA limit 80 µg/L
worst single sample: 17.4 µg/L
8/8 SYR4 2013–2019
Dibromoacetic Acid
1.54 µg/L
No EPA limit set
worst single sample: 1.6 µg/L
7/8 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
2.64 µg/L 4.4%
of the EPA limit 60 µg/L
worst single sample: 2.7 µg/L
7/8 SYR4 2013–2019
Barium
60.15 µg/L 3%
of the EPA limit 2000 µg/L
worst single sample: 61.3 µg/L
6/6 SYR4 2014–2017
Lead
6.695 µg/L 45%
of the EPA limit 15 µg/L
worst single sample: 7.19 µg/L
6/40 SYR4 2014–2017
Dichloroacetic Acid
1.285 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
4/8 SYR4 2013–2019
Tetrachloroethylene
0.7800 µg/L 16%
of the EPA limit 5 µg/L
 4/28 SYR4 2012–2019
Combined Radium (-226 And -228)
1.69 pCi/L 34%
of the EPA limit 5 pCi/L
worst single sample: 1.72 pCi/L
3/3 SYR4 2014
Gross Alpha, Excl. Radon And U
6.97 pCi/L 46%
of the EPA limit 15 pCi/L
worst single sample: 7.21 pCi/L
2/2 SYR4 2014
Gross Beta Particle Activity
2.739 pCi/L
No EPA limit set
worst single sample: 2.79 pCi/L
2/2 SYR4 2014
Styrene
0.1100 µg/L 0.1%
of the EPA limit 100 µg/L
 1/28 SYR4 2012–2019
Xylenes, Total
0.3300 µg/L 0%
of the EPA limit 10000 µg/L
 1/28 SYR4 2012–2019
80 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Frequently asked questions about Monona Waterworks

Is Monona Waterworks tap water safe to drink?

EPA monitoring detected 26 contaminants in Monona 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 Monona Waterworks's water?

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

How many people does Monona Waterworks serve?

Monona Waterworks reports serving 8,624 people in Wisconsin, per its EPA record.

Has Monona Waterworks had any water quality violations?

The EPA has 15 violations on file for Monona Waterworks, of which 1 is 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.