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Tap water quality report

City of Katy

EPA monitoring tested this supplier for 109 contaminants and detected 21. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

109
contaminants tested
21
detected
25,253
people served
0
health-based violations
Texas rankingsLead in TexasPFAS in Texas
Water source
Ground water
Ownership
Local government
Counties served
Harris

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.

0
health-based violations
8
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2025-06-24
MR Monitoring Resolved 2025-06-24
MR Monitoring Resolved 2025-06-24
MR Monitoring Resolved 2019-07-01 → 2019-09-30
MR Monitoring Resolved 2019-07-01 → 2019-09-30
MR Monitoring Resolved 2019-07-01 → 2019-09-30
MR Monitoring Resolved 2019-07-01 → 2019-09-30
MR Monitoring Resolved 1992-07-01 → 1993-06-30

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
390 µg/L 30%
of the EPA limit 1300 µg/L
 125/132 SYR4 2012–2019
Lead
12 µg/L 80%
of the EPA limit 15 µg/L
 33/132 SYR4 2012–2019
Nitrate
30 µg/L 0.3%
of the EPA limit 10000 µg/L
 28/94 SYR4 2012–2019
Bromoform
2.4 µg/L
No EPA limit set
 18/144 SYR4 2012–2019
Barium
195 µg/L 9.8%
of the EPA limit 2000 µg/L
 14/14 SYR4 2012–2019
Fluoride
440 µg/L 11%
of the EPA limit 4000 µg/L
 13/13 SYR4 2012–2018
Lead
0.0027 mg/L 18%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2023
Lithium
24.3 µg/L
No EPA limit set
 12/12 UCMR-5 2024
Combined Radium (-226 And -228)
2.25 pCi/L 45%
of the EPA limit 5 pCi/L
 11/11 SYR4 2012–2019
TTHM
3.1 µg/L 3.9%
of the EPA limit 80 µg/L
 10/110 SYR4 2012–2019
Arsenic
3.5 µg/L 35%
of the EPA limit 10 µg/L
 9/14 SYR4 2012–2019
Dibromochloromethane
1.6 µg/L
No EPA limit set
 9/144 SYR4 2012–2019
Combined Uranium
13.5 µg/L 45%
of the EPA limit 30 µg/L
 7/10 SYR4 2013–2019
Gross Beta Particle Activity
7.8 pCi/L
No EPA limit set
 7/12 SYR4 2012–2019
Xylenes, Total
9.7 µg/L 0.1%
of the EPA limit 10000 µg/L
 7/34 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
12 pCi/L 80%
of the EPA limit 15 pCi/L
 6/10 SYR4 2013–2019
Nitrate-Nitrite
30 µg/L 0.3%
of the EPA limit 10000 µg/L
 4/17 SYR4 2012–2015
Ethylbenzene
1.5 µg/L 0.2%
of the EPA limit 700 µg/L
 3/34 SYR4 2012–2019
Selenium
7.3 µg/L 15%
of the EPA limit 50 µg/L
 2/14 SYR4 2012–2019
Dibromoacetic Acid
1.2 µg/L
No EPA limit set
 1/110 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
1.2 µg/L 2%
of the EPA limit 60 µg/L
 1/110 SYR4 2012–2019
88 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDichloroacetic AcidDinosebEthylene DibromideEndrinHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroacetic AcidTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
THIELE, WILLIAM H
Phone
281-391-4800
Email
mayor@cityofkaty.com

Frequently asked questions about City of Katy

Is City of Katy tap water safe to drink?

EPA monitoring detected 21 contaminants in City of Katy'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 City of Katy's water?

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

How many people does City of Katy serve?

City of Katy reports serving 25,253 people in Texas, per its EPA record.

Has City of Katy had any water quality violations?

The EPA has 8 violations on file for City of Katy, of which 0 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.