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Tap water quality report

Northwest Harris County Mud 9

EPA monitoring tested this supplier for 109 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

109
contaminants tested
18
detected
7,848
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
7
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2026-04-01
MR Monitoring Resolved 2026-04-01
MR Monitoring Resolved 2011-09-22
MR Monitoring Resolved 2011-09-22
MR Monitoring Resolved 2011-09-22
MR Monitoring Resolved 2011-09-22
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
329.2 µg/L 25%
of the EPA limit 1300 µg/L
 53/64 SYR4 2014–2018
Nitrate
190 µg/L 1.9%
of the EPA limit 10000 µg/L
 30/30 SYR4 2012–2019
Lead
13 µg/L 87%
of the EPA limit 15 µg/L
 21/64 SYR4 2014–2018
Lead
0.0438 mg/L 292%
above the EPA limit of 0.0150 mg/L
 16/16 LCR 2026
Arsenic
3.5 µg/L 35%
of the EPA limit 10 µg/L
 6/6 SYR4 2016–2019
Barium
206 µg/L 10%
of the EPA limit 2000 µg/L
 6/6 SYR4 2016–2019
Selenium
8.8 µg/L 18%
of the EPA limit 50 µg/L
 6/6 SYR4 2016–2019
Nitrate-Nitrite
180 µg/L 1.8%
of the EPA limit 10000 µg/L
 5/5 SYR4 2012–2015
Fluoride
120 µg/L 3%
of the EPA limit 4000 µg/L
 4/4 SYR4 2014–2017
Xylenes, Total
4.9 µg/L 0%
of the EPA limit 10000 µg/L
 4/12 SYR4 2012–2019
Lithium
9.85 µg/L
No EPA limit set
 4/4 UCMR-5 2023
Chloroform
4.3 µg/L
No EPA limit set
 2/20 SYR4 2012–2019
Combined Uranium
5.8 µg/L 19%
of the EPA limit 30 µg/L
 2/2 SYR4 2014
Gross Alpha, Excl. Radon And U
4 pCi/L 27%
of the EPA limit 15 pCi/L
 2/2 SYR4 2014
Bromodichloromethane
6.1 µg/L
No EPA limit set
 1/20 SYR4 2012–2019
Bromoform
2.6 µg/L
No EPA limit set
 1/20 SYR4 2012–2019
Dibromochloromethane
6.3 µg/L
No EPA limit set
 1/20 SYR4 2012–2019
Ethylbenzene
0.5000 µg/L 0.1%
of the EPA limit 700 µg/L
 1/12 SYR4 2012–2019
91 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, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDichloroacetic AcidDinosebEthylene DibromideEndrinGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MITCHELL, G, RONALD
Phone
281-646-2340

Frequently asked questions about Northwest Harris County Mud 9

Is Northwest Harris County Mud 9 tap water safe to drink?

EPA monitoring detected 18 contaminants in Northwest Harris County Mud 9'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 Northwest Harris County Mud 9's water?

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

How many people does Northwest Harris County Mud 9 serve?

Northwest Harris County Mud 9 reports serving 7,848 people in Texas, per its EPA record.

Has Northwest Harris County Mud 9 had any water quality violations?

The EPA has 7 violations on file for Northwest Harris County Mud 9, 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.