Is Mercer County Pwsd 1 Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: Harrison, Mercer

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	2015-07-01 → 2015-09-30
MCL	Health-based	Resolved	2015-07-01 → 2015-09-30
MCL	Health-based	Resolved	2015-07-01 → 2015-09-30
MCL	Health-based	Resolved	2015-07-01 → 2015-09-30
MCL	Health-based	Resolved	2010-12-01 → 2010-12-31
MCL	Health-based	Resolved	2010-12-01 → 2010-12-31
MCL	Health-based	Resolved	2010-12-01 → 2010-12-31
MCL	Health-based	Resolved	2010-12-01 → 2010-12-31
MCL	Health-based	Resolved	2003-05-01 → 2003-05-31
MCL	Health-based	Resolved	2003-05-01 → 2003-05-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
Pfba	0.0130 µg/L	8/12	2024

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	24.58 µg/L No EPA limit set worst single sample: 28.9 µg/L	50/50	SYR4	2013–2019
Chloroform	56.305 µg/L No EPA limit set worst single sample: 109 µg/L	50/50	SYR4	2013–2019
Dibromochloromethane	13.11 µg/L No EPA limit set worst single sample: 15.4 µg/L	50/50	SYR4	2013–2019
TTHM	92.725 µg/L 116% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 120 µg/L	50/50	SYR4	2013–2019
Trichloroacetic Acid	13.47 µg/L No EPA limit set worst single sample: 27.8 µg/L	50/50	SYR4	2013–2019
Dichloroacetic Acid	24.22 µg/L No EPA limit set worst single sample: 33.8 µg/L	49/50	SYR4	2013–2019
Total Haloacetic Acids (HAA5)	38.525 µg/L 64% of the EPA limit 60 µg/L worst single sample: 61.6 µg/L	46/50	SYR4	2013–2019
Bromoform	2.622 µg/L No EPA limit set worst single sample: 2.82 µg/L	25/50	SYR4	2013–2019
Dibromoacetic Acid	4.23 µg/L No EPA limit set worst single sample: 8.34 µg/L	25/50	SYR4	2013–2019
Copper	160.2 µg/L 12% of the EPA limit 1300 µg/L worst single sample: 202 µg/L	20/20	SYR4	2014–2017
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	20/20	LCR	2023
Monobromoacetic Acid	7.299 µg/L No EPA limit set worst single sample: 9.08 µg/L	14/50	SYR4	2013–2019
Lead	3.224 µg/L 21% of the EPA limit 15 µg/L worst single sample: 3.37 µg/L	5/20	SYR4	2014–2017
Lithium	9.6 µg/L No EPA limit set	1/12	UCMR-5	2024

29 contaminants tested, none detected

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Utility contact

Contact: SIEMER, TIFFANY
Phone: 660-382-4776
Email: [email protected]

Frequently asked questions about Mercer County Pwsd 1

Is Mercer County Pwsd 1 tap water safe to drink?

EPA monitoring detected 15 contaminants in Mercer County Pwsd 1'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 Mercer County Pwsd 1's water?

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

How many people does Mercer County Pwsd 1 serve?

Mercer County Pwsd 1 reports serving 3,200 people in Missouri, per its EPA record.

Has Mercer County Pwsd 1 had any water quality violations?

The EPA has 40 violations on file for Mercer County Pwsd 1, of which 11 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.