Is Mount Zion Wsc Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: Rockwall

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
TT	Health-based	Resolved	2024-10-17
TT	Health-based	Resolved	2024-10-17
TT	Health-based	Resolved	2024-10-17
TT	Health-based	Resolved	2014-04-01
TT	Health-based	Resolved	2013-12-01
TT	Health-based	Resolved	2013-12-01
Other	Monitoring	Unaddressed	2026-04-16
MR	Monitoring	Unaddressed	2025-12-30
Other	Monitoring	Unaddressed	2025-05-15
RPT	Monitoring	Resolved	2024-10-17

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	840.5 µg/L 65% of the EPA limit 1300 µg/L worst single sample: 1100 µg/L	74/75	SYR4	2013–2019
Lead	7.334 µg/L 49% of the EPA limit 15 µg/L worst single sample: 254 µg/L	43/75	SYR4	2013–2019
Bromodichloromethane	24.41 µg/L No EPA limit set worst single sample: 32.3 µg/L	27/27	SYR4	2012–2019
Chloroform	24.42 µg/L No EPA limit set worst single sample: 27.7 µg/L	27/27	SYR4	2012–2019
Dibromochloromethane	14.57 µg/L No EPA limit set worst single sample: 26.4 µg/L	27/27	SYR4	2012–2019
Dichloroacetic Acid	17.21 µg/L No EPA limit set worst single sample: 18.5 µg/L	27/27	SYR4	2012–2019
TTHM	67.92 µg/L 85% of the EPA limit 80 µg/L worst single sample: 111.3 µg/L	27/27	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	39.49 µg/L 66% of the EPA limit 60 µg/L worst single sample: 41.8 µg/L	27/27	SYR4	2012–2019
Trichloroacetic Acid	6.84 µg/L No EPA limit set worst single sample: 7.2 µg/L	27/27	SYR4	2012–2019
Dibromoacetic Acid	9.91 µg/L No EPA limit set worst single sample: 11.8 µg/L	19/27	SYR4	2012–2019
Bromoform	26.32 µg/L No EPA limit set worst single sample: 32.4 µg/L	17/27	SYR4	2012–2019
Monobromoacetic Acid	16.02 µg/L No EPA limit set worst single sample: 17 µg/L	15/27	SYR4	2012–2019
Monochloroacetic Acid	8.56 µg/L No EPA limit set worst single sample: 9 µg/L	12/27	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	10/10	LCR	2025

Utility contact

Contact: RINNER, STEVE
Phone: 469-377-1399

Frequently asked questions about Mount Zion Wsc

Is Mount Zion Wsc tap water safe to drink?

EPA monitoring detected 14 contaminants in Mount Zion Wsc'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 Mount Zion Wsc's water?

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

How many people does Mount Zion Wsc serve?

Mount Zion Wsc reports serving 2,028 people in Texas, per its EPA record.

Has Mount Zion Wsc had any water quality violations?

The EPA has 35 violations on file for Mount Zion Wsc, of which 6 are health-based (a contaminant limit or required treatment was breached) and 6 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.