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.
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 2016-01-01 → 2016-03-31 |
| MCL | Health-based | Resolved | 2016-01-01 → 2016-03-31 |
| MCL | Health-based | Resolved | 2016-01-01 → 2016-03-31 |
| MCL | Health-based | Resolved | 2016-01-01 → 2016-03-31 |
| MCL | Health-based | Resolved | 2016-01-01 → 2016-03-31 |
| MCL | Health-based | Resolved | 2016-01-01 → 2016-03-31 |
| MCL | Health-based | Resolved | 2015-10-01 → 2015-12-31 |
| MCL | Health-based | Resolved | 2015-10-01 → 2015-12-31 |
| MCL | Health-based | Resolved | 2015-10-01 → 2015-12-31 |
| MCL | Health-based | Resolved | 2015-10-01 → 2015-12-31 |
PFAS detected
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Copper | 114 µg/L 8.8% of the EPA limit 1300 µg/L | 58/60 | SYR4 | 2013–2019 |
| TTHM | 272 µg/L 340% of the EPA limit, in the worst sample — 80 µg/L | 53/62 | SYR4 | 2012–2019 |
| Dibromochloromethane | 16.9 µg/L No EPA limit set | 50/62 | SYR4 | 2012–2019 |
| Bromoform | 5.2 µg/L No EPA limit set | 39/62 | SYR4 | 2012–2019 |
| Bromodichloromethane | 53.8 µg/L No EPA limit set | 36/62 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 108 µg/L 180% of the EPA limit, in the worst sample — 60 µg/L | 29/62 | SYR4 | 2012–2019 |
| Chloroform | 199 µg/L No EPA limit set | 20/62 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 51.3 µg/L No EPA limit set | 20/62 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 2.2 µg/L No EPA limit set | 19/62 | SYR4 | 2012–2019 |
| Lead | 3.4 µg/L 23% of the EPA limit 15 µg/L | 18/60 | SYR4 | 2013–2019 |
| Nitrate | 890 µg/L 8.9% of the EPA limit 10000 µg/L | 16/16 | SYR4 | 2012–2019 |
| Lead | 0.0029 mg/L 20% of the EPA limit 0.0150 mg/L | 15/15 | LCR | 2023 |
| Trichloroacetic Acid | 47.5 µg/L No EPA limit set | 15/62 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 7.4 µg/L No EPA limit set | 4/62 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 620 µg/L 6.2% of the EPA limit 10000 µg/L | 4/4 | SYR4 | 2012–2015 |
| Dalapon | 1.9 µg/L 1% of the EPA limit 200 µg/L | 1/62 | SYR4 | 2012–2019 |
| Lithium | 18.1 µg/L No EPA limit set | 1/2 | UCMR-5 | 2024 |
31 contaminants tested, none detected
Utility contact
Frequently asked questions about Harris County Wcid 21
Is Harris County Wcid 21 tap water safe to drink?
EPA monitoring detected 19 contaminants in Harris County Wcid 21'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 Wcid 21's water?
EPA monitoring detected Copper, TTHM, Dibromochloromethane, Bromoform, Bromodichloromethane, and others. The full list with the level and data source for each is above.
How many people does Harris County Wcid 21 serve?
Harris County Wcid 21 reports serving 13,845 people in Texas, per its EPA record.
Has Harris County Wcid 21 had any water quality violations?
The EPA has 40 violations on file for Harris County Wcid 21, of which 18 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.