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Tap water quality report

Norwalk City

EPA monitoring tested this supplier for 83 contaminants and detected 21. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

83
contaminants tested
21
detected
17,466
people served
26
health-based violations
Ohio rankingsLead in OhioPFAS in Ohio
Water source
Surface water
Ownership
Private
Counties served
Huron

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.

26
health-based violations
44
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2004-10-01 → 2004-12-31
MCL Health-based Resolved 2004-10-01 → 2004-12-31
MCL Health-based Resolved 2004-10-01 → 2004-12-31
MCL Health-based Resolved 2004-10-01 → 2004-12-31
MCL Health-based Resolved 2004-07-01 → 2004-09-30
MCL Health-based Resolved 2004-07-01 → 2004-09-30
MCL Health-based Resolved 2004-07-01 → 2004-09-30
MCL Health-based Resolved 2004-07-01 → 2004-09-30
MCL Health-based Resolved 2003-04-01 → 2003-06-30
MCL Health-based Resolved 2003-04-01 → 2003-06-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfba 0.0102 µg/L 3/4 2023

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
Nitrate
980.5 µg/L 9.8%
of the EPA limit 10000 µg/L
worst single sample: 1120 µg/L
154/194 SYR4 2012–2019
Chloroform
60.815 µg/L
No EPA limit set
worst single sample: 71.8 µg/L
134/134 SYR4 2012–2019
Bromodichloromethane
16.14 µg/L
No EPA limit set
worst single sample: 19.4 µg/L
133/134 SYR4 2012–2019
Dibromochloromethane
5.345 µg/L
No EPA limit set
worst single sample: 8.8 µg/L
132/133 SYR4 2012–2019
TTHM
79.49 µg/L 99%
of the EPA limit 80 µg/L
worst single sample: 92.2 µg/L
128/128 SYR4 2012–2019
Trichloroacetic Acid
19.22 µg/L
No EPA limit set
worst single sample: 39.7 µg/L
127/128 SYR4 2012–2019
Dichloroacetic Acid
19.625 µg/L
No EPA limit set
worst single sample: 28.5 µg/L
126/127 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
38.325 µg/L 64%
of the EPA limit 60 µg/L
worst single sample: 65.3 µg/L
126/127 SYR4 2012–2019
Copper
250.8 µg/L 19%
of the EPA limit 1300 µg/L
worst single sample: 391 µg/L
89/161 SYR4 2013–2019
Nitrate-Nitrite
986 µg/L 9.9%
of the EPA limit 10000 µg/L
worst single sample: 1140 µg/L
77/97 SYR4 2012–2019
Dibromoacetic Acid
2.38 µg/L
No EPA limit set
worst single sample: 2.4 µg/L
25/128 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 18/18 LCR 2025
Monochloroacetic Acid
3.69 µg/L
No EPA limit set
worst single sample: 5.3 µg/L
15/128 SYR4 2012–2019
Lead
16.45 µg/L 110%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 17 µg/L
12/90 SYR4 2013–2019
Barium
20.95 µg/L 1%
of the EPA limit 2000 µg/L
worst single sample: 22 µg/L
8/8 SYR4 2012–2019
Fluoride
1035.85 µg/L 26%
of the EPA limit 4000 µg/L
worst single sample: 1060 µg/L
8/8 SYR4 2012–2019
Bromoform
0.8700 µg/L
No EPA limit set
worst single sample: 0.9000 µg/L
7/134 SYR4 2012–2019
Atrazine
0.3730 µg/L 12%
of the EPA limit 3 µg/L
worst single sample: 0.4000 µg/L
3/23 SYR4 2012–2019
Simazine
0.3620 µg/L 9%
of the EPA limit 4 µg/L
worst single sample: 0.3700 µg/L
3/23 SYR4 2012–2019
Gross Beta Particle Activity
4.1 pCi/L
No EPA limit set
 1/1 SYR4 2015
62 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicBenzeneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbon TetrachlorideChromiumDichloromethaneEthylbenzeneHfpo-DaLassoMercuryMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitritePFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
OSBORN, AARON
Phone
419-663-6736
Email
[email protected]

Frequently asked questions about Norwalk City

Is Norwalk City tap water safe to drink?

EPA monitoring detected 21 contaminants in Norwalk City'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 Norwalk City's water?

EPA monitoring detected Nitrate, Chloroform, Bromodichloromethane, Dibromochloromethane, TTHM, and others. The full list with the level and data source for each is above.

How many people does Norwalk City serve?

Norwalk City reports serving 17,466 people in Ohio, per its EPA record.

Has Norwalk City had any water quality violations?

The EPA has 44 violations on file for Norwalk City, of which 26 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.