Compliance record
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.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Copper | 144 µg/L 11% of the EPA limit 1300 µg/L
worst single sample: 310 µg/L | 113/121 | SYR4 | 2014–2019 |
| Nitrate | 80 µg/L 0.8% of the EPA limit 10000 µg/L | 16/16 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 13/13 | LCR | 2025 |
| Lead | 4.24 µg/L 28% of the EPA limit 15 µg/L
worst single sample: 4.3 µg/L | 13/121 | SYR4 | 2014–2019 |
| Bromoform | 2.65 µg/L No EPA limit set
worst single sample: 2.8 µg/L | 6/18 | SYR4 | 2013–2019 |
| Dibromochloromethane | 2.45 µg/L No EPA limit set
worst single sample: 2.5 µg/L | 6/18 | SYR4 | 2013–2019 |
| TTHM | 4.975 µg/L 6.2% of the EPA limit 80 µg/L
worst single sample: 5.3 µg/L | 6/13 | SYR4 | 2013–2019 |
| Fluoride | 224 µg/L 5.6% of the EPA limit 4000 µg/L
worst single sample: 230 µg/L | 3/3 | SYR4 | 2012–2018 |
| Nitrate-Nitrite | 80 µg/L 0.8% of the EPA limit 10000 µg/L | 3/3 | SYR4 | 2013–2019 |
| Arsenic | 2.7 µg/L 27% of the EPA limit 10 µg/L | 2/2 | SYR4 | 2015–2018 |
| Barium | 409.7 µg/L 20% of the EPA limit 2000 µg/L
worst single sample: 410 µg/L | 2/2 | SYR4 | 2015–2018 |
| Combined Radium (-226 And -228) | 3.195 pCi/L 64% of the EPA limit 5 pCi/L
worst single sample: 3.3 pCi/L | 2/3 | SYR4 | 2012–2018 |
| Combined Uranium | 1.295 µg/L 4.3% of the EPA limit 30 µg/L
worst single sample: 1.3 µg/L | 2/2 | SYR4 | 2015–2018 |
| Gross Alpha, Excl. Radon And U | 3.95 pCi/L 26% of the EPA limit 15 pCi/L
worst single sample: 4 pCi/L | 2/2 | SYR4 | 2015–2018 |
| Lithium | 18.1 µg/L No EPA limit set | 2/2 | UCMR-5 | 2025 |
| Dibromoacetic Acid | 1.1 µg/L No EPA limit set | 1/13 | SYR4 | 2013–2019 |
| Gross Beta Particle Activity | 4.4 pCi/L No EPA limit set | 1/3 | SYR4 | 2012–2018 |
| Total Haloacetic Acids (HAA5) | 1.1 µg/L 1.8% of the EPA limit 60 µg/L | 1/13 | SYR4 | 2013–2019 |
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, TotalBromodichloromethaneChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDichloroacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Harris County Mud 221
Is Harris County Mud 221 tap water safe to drink?
EPA monitoring detected 18 contaminants in Harris County Mud 221'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 Mud 221's water?
EPA monitoring detected Copper, Nitrate, Lead, Lead, Bromoform, and others. The full list with the level and data source for each is above.
How many people does Harris County Mud 221 serve?
Harris County Mud 221 reports serving 4,839 people in Texas, per its EPA record.
Has Harris County Mud 221 had any water quality violations?
The EPA has no formal drinking-water violations on file for Harris County Mud 221.
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.