Is Mayville City of Tap Water Safe? Quality Report

Water source: GWP
Ownership: Local government
Counties served: Traill

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	Archived	2007-07-01 → 2007-07-31
MCL	Health-based	Archived	2007-07-01 → 2007-07-31
MCL	Health-based	Archived	2007-07-01 → 2007-07-31
TT	Health-based	Archived	2003-03-01 → 2003-03-31
TT	Health-based	Archived	2003-03-01 → 2003-03-31
TT	Health-based	Archived	2003-03-01 → 2003-03-31
MR	Monitoring	Archived	2005-03-01 → 2005-03-31
MR	Monitoring	Archived	2005-03-01 → 2005-03-31
MR	Monitoring	Archived	2005-03-01 → 2005-03-31
MR	Monitoring	Resolved	2004-07-01 → 2004-09-30

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
Copper	1251 µg/L 96% of the EPA limit 1300 µg/L worst single sample: 1510 µg/L	30/30	SYR4	2013–2019
Lead	14.77 µg/L 98% of the EPA limit 15 µg/L worst single sample: 17.2 µg/L	24/30	SYR4	2013–2019
Lead	0.0027 mg/L 18% of the EPA limit 0.0150 mg/L	16/16	LCR	2025
Bromodichloromethane	1.64 µg/L No EPA limit set worst single sample: 1.66 µg/L	6/7	SYR4	2014–2019
Chloroform	1.44 µg/L No EPA limit set worst single sample: 1.46 µg/L	6/7	SYR4	2014–2019
Dibromochloromethane	1.32 µg/L No EPA limit set worst single sample: 1.37 µg/L	6/7	SYR4	2014–2019
TTHM	4.36 µg/L 5.5% of the EPA limit 80 µg/L worst single sample: 4.41 µg/L	6/7	SYR4	2014–2019
Total Haloacetic Acids (HAA5)	1.218 µg/L 2% of the EPA limit 60 µg/L worst single sample: 1.22 µg/L	3/7	SYR4	2014–2019
Dichloroacetic Acid	1.216 µg/L No EPA limit set worst single sample: 1.22 µg/L	2/7	SYR4	2014–2019
Monobromoacetic Acid	1.2 µg/L No EPA limit set	1/7	SYR4	2014–2019

4 contaminants tested, none detected

BromoformDibromoacetic AcidMonochloroacetic AcidTrichloroacetic Acid

Utility contact

Contact: OLSTAD, GAIL
Phone: 701-788-2166
Email: [email protected]

Frequently asked questions about Mayville City of

Is Mayville City of tap water safe to drink?

EPA monitoring detected 10 contaminants in Mayville City of'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 Mayville City of's water?

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

How many people does Mayville City of serve?

Mayville City of reports serving 1,858 people in North Dakota, per its EPA record.

Has Mayville City of had any water quality violations?

The EPA has 23 violations on file for Mayville City of, 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.