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 | 308.8 µg/L 24% of the EPA limit 1300 µg/L
worst single sample: 410 µg/L | 57/62 | SYR4 | 2012–2018 |
| Lead | 4.804 µg/L 32% of the EPA limit 15 µg/L
worst single sample: 5 µg/L | 15/62 | SYR4 | 2012–2018 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 14/14 | LCR | 2024 |
| Dibromochloromethane | 1.47 µg/L No EPA limit set
worst single sample: 1.5 µg/L | 3/12 | SYR4 | 2013–2019 |
| TTHM | 2.57 µg/L 3.2% of the EPA limit 80 µg/L
worst single sample: 2.6 µg/L | 3/7 | SYR4 | 2013–2019 |
| Arsenic | 5.205 µg/L 52% of the EPA limit 10 µg/L
worst single sample: 5.3 µg/L | 2/2 | SYR4 | 2014–2017 |
| Barium | 157.7 µg/L 7.9% of the EPA limit 2000 µg/L
worst single sample: 158 µg/L | 2/2 | SYR4 | 2014–2017 |
| Bromodichloromethane | 1.1 µg/L No EPA limit set | 2/12 | SYR4 | 2013–2019 |
| Combined Radium (-226 And -228) | 3.66 pCi/L 73% of the EPA limit 5 pCi/L
worst single sample: 3.8 pCi/L | 2/2 | SYR4 | 2014–2017 |
| Fluoride | 358.5 µg/L 9% of the EPA limit 4000 µg/L
worst single sample: 360 µg/L | 2/2 | SYR4 | 2014–2017 |
| Gross Alpha, Excl. Radon And U | 5.32 pCi/L 35% of the EPA limit 15 pCi/L
worst single sample: 5.4 pCi/L | 2/2 | SYR4 | 2014–2017 |
| Lithium | 20.3 µg/L No EPA limit set | 2/2 | UCMR-5 | 2023 |
97 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, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDichloroacetic AcidDinosebEthylene DibromideEndrinEthylbenzeneGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitrateNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Cornerstones Mud
Is Cornerstones Mud tap water safe to drink?
EPA monitoring detected 12 contaminants in Cornerstones Mud'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 Cornerstones Mud's water?
EPA monitoring detected Copper, Lead, Lead, Dibromochloromethane, TTHM, and others. The full list with the level and data source for each is above.
How many people does Cornerstones Mud serve?
Cornerstones Mud reports serving 5,331 people in Texas, per its EPA record.
Has Cornerstones Mud had any water quality violations?
The EPA has no formal drinking-water violations on file for Cornerstones Mud.
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.