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Tap water quality report

Harris County Improvement District 18

EPA monitoring tested this supplier for 107 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

107
contaminants tested
18
detected
5,025
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
6
violations on file
0
still open
ViolationTypeStatusPeriod
Other Monitoring Resolved 2025-07-01
Other Monitoring Resolved 2025-07-01
MR Monitoring Resolved 2016-07-01
MR Monitoring Resolved 2016-07-01
MR Monitoring Resolved 2016-07-01
MR Monitoring Resolved 2016-07-01

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
327.4 µg/L 25%
of the EPA limit 1300 µg/L
worst single sample: 1083 µg/L
155/161 SYR4 2015–2017
Lead
9.085 µg/L 61%
of the EPA limit 15 µg/L
worst single sample: 20 µg/L
30/161 SYR4 2015–2017
Dibromochloromethane
13.72 µg/L
No EPA limit set
worst single sample: 13.8 µg/L
17/17 SYR4 2015–2019
Bromoform
25.67 µg/L
No EPA limit set
worst single sample: 25.8 µg/L
14/17 SYR4 2015–2019
Bromodichloromethane
4.57 µg/L
No EPA limit set
worst single sample: 4.9 µg/L
12/17 SYR4 2015–2019
TTHM
43.385 µg/L 54%
of the EPA limit 80 µg/L
worst single sample: 43.7 µg/L
10/10 SYR4 2015–2019
Dibromoacetic Acid
4.065 µg/L
No EPA limit set
worst single sample: 4.1 µg/L
8/10 SYR4 2015–2019
Nitrate
30 µg/L 0.3%
of the EPA limit 10000 µg/L
 8/10 SYR4 2015–2019
Total Haloacetic Acids (HAA5)
4.99 µg/L 8.3%
of the EPA limit 60 µg/L
worst single sample: 5.2 µg/L
8/10 SYR4 2015–2019
Chloroform
1.65 µg/L
No EPA limit set
worst single sample: 1.7 µg/L
6/17 SYR4 2015–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 6/6 LCR 2023
Barium
118.52 µg/L 5.9%
of the EPA limit 2000 µg/L
worst single sample: 120 µg/L
2/2 SYR4 2015–2018
Dichloroacetic Acid
1.285 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
2/10 SYR4 2015–2019
Fluoride
2201 µg/L 55%
of the EPA limit 4000 µg/L
worst single sample: 2280 µg/L
2/2 SYR4 2015–2018
Trichloroacetic Acid
1.095 µg/L
No EPA limit set
worst single sample: 1.1 µg/L
2/10 SYR4 2015–2019
Lithium
44.6 µg/L
No EPA limit set
 2/2 UCMR-5 2025
Arsenic
2.1 µg/L 21%
of the EPA limit 10 µg/L
 1/2 SYR4 2015–2018
Selenium
3.8 µg/L 7.6%
of the EPA limit 50 µg/L
 1/2 SYR4 2015–2018
89 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 UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneGross Alpha, Excl. Radon And UGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
DEDEN, ROBERT, T
Phone
713-860-6400

Frequently asked questions about Harris County Improvement District 18

Is Harris County Improvement District 18 tap water safe to drink?

EPA monitoring detected 18 contaminants in Harris County Improvement District 18'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 Harris County Improvement District 18's water?

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

How many people does Harris County Improvement District 18 serve?

Harris County Improvement District 18 reports serving 5,025 people in Texas, per its EPA record.

Has Harris County Improvement District 18 had any water quality violations?

The EPA has 6 violations on file for Harris County Improvement District 18, 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.