A91/100
CITY OF MCKINNEY — Water Quality Report 2026
Serving 224,043 people · Texas
Water Source
Purchased Surface Water
County
—
System ID
TX0430039
Violations
3
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 700.00 µg/L | — | Above Goal |
Lead (90th percentile) | < 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2021.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About CITY OF MCKINNEY
Is CITY OF MCKINNEY water safe to drink?
CITY OF MCKINNEY water receives a grade of A (91/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has CITY OF MCKINNEY detected?
76 contaminants were tested in CITY OF MCKINNEY's water. Notable contaminants include Lead (90th percentile), chlorate. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).
Does CITY OF MCKINNEY have any EPA violations?
Yes, CITY OF MCKINNEY has 3 EPA violation(s) on record, with the most recent in 2021. Violation types include MR.
How many people does CITY OF MCKINNEY serve?
CITY OF MCKINNEY serves approximately 224,043 people, Texas.
What type of water does CITY OF MCKINNEY provide?
CITY OF MCKINNEY sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is TX0430039.
How does CITY OF MCKINNEY compare to other utilities in Texas?
CITY OF MCKINNEY scores 91/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Texas state page for a full comparison of water systems.