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 single worst sample on
record — over 100% is worth reading, but is not by itself a violation.
Formal violations are listed separately.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Copper | 950 µg/L 73% of the EPA limit 1300 µg/L | 30/33 | SYR4 | 2012–2019 |
| Nitrate | 910 µg/L 9.1% of the EPA limit 10000 µg/L | 26/32 | SYR4 | 2012–2019 |
| Bromodichloromethane | 16 µg/L No EPA limit set | 12/17 | SYR4 | 2013–2019 |
| Chloroform | 34 µg/L No EPA limit set | 12/17 | SYR4 | 2013–2019 |
| Lead | 67 µg/L 447% of the EPA limit, in the worst sample — 15 µg/L | 12/33 | SYR4 | 2012–2019 |
| Dibromochloromethane | 6.1 µg/L No EPA limit set | 10/17 | SYR4 | 2013–2019 |
| Bromoform | 1.4 µg/L No EPA limit set | 6/17 | SYR4 | 2013–2019 |
| Barium | 172 µg/L 8.6% of the EPA limit 2000 µg/L | 5/5 | SYR4 | 2012–2019 |
| Fluoride | 450 µg/L 11% of the EPA limit 4000 µg/L | 5/5 | SYR4 | 2012–2018 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 5/5 | LCR | 2023 |
| Combined Radium (-226 And -228) | 3.8 pCi/L 76% of the EPA limit 5 pCi/L | 4/5 | SYR4 | 2012–2018 |
| Dibromoacetic Acid | 2.2 µg/L No EPA limit set | 4/7 | SYR4 | 2013–2019 |
| Dichloroacetic Acid | 28.4 µg/L No EPA limit set | 4/7 | SYR4 | 2013–2019 |
| Gross Alpha, Excl. Radon And U | 5 pCi/L 33% of the EPA limit 15 pCi/L | 4/4 | SYR4 | 2014–2018 |
| Nitrate-Nitrite | 910 µg/L 9.1% of the EPA limit 10000 µg/L | 4/6 | SYR4 | 2012–2019 |
| TTHM | 47.3 µg/L 59% of the EPA limit 80 µg/L | 4/7 | SYR4 | 2013–2019 |
| Total Haloacetic Acids (HAA5) | 41 µg/L 68% of the EPA limit 60 µg/L | 4/7 | SYR4 | 2013–2019 |
| Trichloroacetic Acid | 10.4 µg/L No EPA limit set | 4/7 | SYR4 | 2013–2019 |
| Atrazine | 0.3800 µg/L 13% of the EPA limit 3 µg/L | 3/8 | SYR4 | 2015–2019 |
| Cyanide | 90 µg/L 45% of the EPA limit 200 µg/L | 2/4 | SYR4 | 2014–2017 |
| Combined Uranium | 1.6 µg/L 5.3% of the EPA limit 30 µg/L | 2/4 | SYR4 | 2014–2018 |
| Simazine | 0.0900 µg/L 2.3% of the EPA limit 4 µg/L | 2/8 | SYR4 | 2015–2019 |
| Arsenic | 2.1 µg/L 21% of the EPA limit 10 µg/L | 1/5 | SYR4 | 2012–2019 |
| Bhc-Gamma | 0.0600 µg/L 30% of the EPA limit 0.2000 µg/L | 1/8 | SYR4 | 2015–2019 |
| Di(2-ethylhexyl) Phthalate | 0.9100 µg/L 15% of the EPA limit 6 µg/L | 1/8 | SYR4 | 2015–2019 |
54 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAsbestosBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebEthylene DibromideEndrinEthylbenzeneGross Beta Particle ActivityHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Grand Lakes Mud 4
Is Grand Lakes Mud 4 tap water safe to drink?
EPA monitoring detected 25 contaminants in Grand Lakes Mud 4'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 Grand Lakes Mud 4's water?
EPA monitoring detected Copper, Nitrate, Bromodichloromethane, Chloroform, Lead, and others. The full list with the level and data source for each is above.
How many people does Grand Lakes Mud 4 serve?
Grand Lakes Mud 4 reports serving 3,867 people in Texas, per its EPA record.
Has Grand Lakes Mud 4 had any water quality violations?
The EPA has no formal drinking-water violations on file for Grand Lakes Mud 4.
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.