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Tap water quality report

Mckinney, TX

EPA monitoring detected 15 contaminants across the 2 water suppliers serving Mckinney. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
227,407
people served
15
contaminants found
Texas rankings Lead in Texas PFAS in Texas

What was found in Mckinney's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Copper
756.05 µg/L 58%
of the EPA limit 1300 µg/L
Main supplier: CITY OF MCKINNEY · 224,043 people · 2018
Highest in the city: 944 µg/L — MILLIGAN WSC · 3,364 people · 2019
2/2 SYR4
TTHM
60.995 µg/L 76%
of the EPA limit 80 µg/L
Main supplier: CITY OF MCKINNEY · 224,043 people · 2019
2/2 SYR4
Lead
4.175 µg/L 28%
of the EPA limit 15 µg/L
Main supplier: CITY OF MCKINNEY · 224,043 people · 2018
Highest in the city: 42.2 µg/L — MILLIGAN WSC · 3,364 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
33.51 µg/L 56%
of the EPA limit 60 µg/L
Main supplier: CITY OF MCKINNEY · 224,043 people · 2019
2/2 SYR4
Bromodichloromethane
24.155 µg/L
No EPA limit set
Main supplier: CITY OF MCKINNEY · 224,043 people · 2019
2/2 SYR4
Dichloroacetic Acid
22.055 µg/L
No EPA limit set
Main supplier: CITY OF MCKINNEY · 224,043 people · 2019
2/2 SYR4
Chloroform
18.355 µg/L
No EPA limit set
Main supplier: CITY OF MCKINNEY · 224,043 people · 2019
2/2 SYR4
Dibromochloromethane
16.11 µg/L
No EPA limit set
Main supplier: CITY OF MCKINNEY · 224,043 people · 2019
2/2 SYR4
Dibromoacetic Acid
11.995 µg/L
No EPA limit set
Main supplier: CITY OF MCKINNEY · 224,043 people · 2019
2/2 SYR4
Trichloroacetic Acid
5.7 µg/L
No EPA limit set
Main supplier: CITY OF MCKINNEY · 224,043 people · 2019
2/2 SYR4
Bromoform
5.5545 µg/L
No EPA limit set
Main supplier: CITY OF MCKINNEY · 224,043 people · 2019
2/2 SYR4
Monochloroacetic Acid
4.55 µg/L
No EPA limit set
Main supplier: CITY OF MCKINNEY · 224,043 people · 2019
Highest in the city: 5.36 µg/L — MILLIGAN WSC · 3,364 people · 2019
2/2 SYR4
Monobromoacetic Acid
4.95 µg/L
No EPA limit set
Main supplier: CITY OF MCKINNEY · 224,043 people · 2019
2/2 SYR4
Pfba
0.0087 µg/L
No EPA limit set
Main supplier: CITY OF MCKINNEY · 224,043 people · 2025
1/2 UCMR-5
Lead
0.00090 mg/L 6%
of the EPA limit 0.0150 mg/L
Main supplier: CITY OF MCKINNEY · 224,043 people · 2025
2/2 LCR
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 the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Mckinney

SupplierPopulation served
CITY OF MCKINNEY 224,043
MILLIGAN WSC 3,364

Frequently asked questions about Mckinney tap water

Is Mckinney tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Mckinney. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Mckinney?

2 public water suppliers report drinking-water monitoring for Mckinney, Texas to the EPA. Each is listed above with its population served.

What contaminants are in Mckinney's water?

The contaminants EPA monitoring detected in Mckinney include Copper, TTHM, Lead, Total Haloacetic Acids (HAA5), Bromodichloromethane. The full list, with the level at the main supplier and the data source, is in the table above.

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.