What was found in Rio Hondo's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Chlorite | 864.8 µg/L 86% of the EPA limit 1000 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/3 | SYR4 |
| Fluoride | 515 µg/L 13% of the EPA limit 4000 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/3 | SYR4 |
| Copper | 89.65 µg/L 6.9% of the EPA limit 1300 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 417.75 µg/L — CITY OF RIO HONDO · 2,640 people · 2017 | 3/3 | SYR4 |
| Nitrate | 358.5 µg/L 3.6% of the EPA limit 10000 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/3 | SYR4 |
| Nitrate-Nitrite | 321 µg/L 3.2% of the EPA limit 10000 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/3 | SYR4 |
| TTHM | 55.125 µg/L 69% of the EPA limit 80 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 203.2 µg/L — CITY OF RIO HONDO · 2,640 people · 2019 | 3/3 | SYR4 |
| Barium | 165.85 µg/L 8.3% of the EPA limit 2000 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 167.3 µg/L — CITY OF RIO HONDO · 2,640 people · 2019 | 2/3 | SYR4 |
| Cyanide | 162.5 µg/L 81% of the EPA limit 200 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 29.375 µg/L 49% of the EPA limit 60 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 96.78 µg/L — CITY OF RIO HONDO · 2,640 people · 2019 | 3/3 | SYR4 |
| Nitrite | 82 µg/L 8.2% of the EPA limit 1000 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/3 | SYR4 |
| Bromodichloromethane | 14.04 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 71.455 µg/L — CITY OF RIO HONDO · 2,640 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 18.66 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 63.265 µg/L — CITY OF RIO HONDO · 2,640 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 12.12 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 61.44 µg/L — CITY OF RIO HONDO · 2,640 people · 2019 | 3/3 | SYR4 |
| Chloroform | 6.41 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 60.76 µg/L — CITY OF RIO HONDO · 2,640 people · 2019 | 3/3 | SYR4 |
| Lithium | 56.5 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/3 | UCMR-5 |
| Bromoform | 20.04 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 35.475 µg/L — CITY OF RIO HONDO · 2,640 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 3.7 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 25.81 µg/L — CITY OF RIO HONDO · 2,640 people · 2019 | 3/3 | SYR4 |
| Dibromoacetic Acid | 13.49 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 25.48 µg/L — CITY OF RIO HONDO · 2,640 people · 2019 | 3/3 | SYR4 |
| Gross Beta Particle Activity | 8.605 pCi/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2018
Highest in the city: 9.4 pCi/L — CITY OF RIO HONDO · 2,640 people · 2018 | 2/3 | SYR4 |
| Monobromoacetic Acid | 8.66 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 9 µg/L — EAST RIO HONDO WSC ARROYO CITY · 1,953 people · 2019 | 3/3 | SYR4 |
| Monochloroacetic Acid | 6.34 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 8.66 µg/L — CITY OF RIO HONDO · 2,640 people · 2019 | 3/3 | SYR4 |
| Selenium | 4.69 µg/L 9.4% of the EPA limit 50 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019
Highest in the city: 5.6 µg/L — CITY OF RIO HONDO · 2,640 people · 2019 | 2/3 | SYR4 |
| Lead | 5.3115 µg/L 35% of the EPA limit 15 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 3/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2015
Highest in the city: 4.9 pCi/L — CITY OF RIO HONDO · 2,640 people · 2012 | 2/3 | SYR4 |
| Arsenic | 2.89 µg/L 29% of the EPA limit 10 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 2/3 | SYR4 |
| Dalapon | 1.77 µg/L 0.9% of the EPA limit 200 µg/L Highest in the city: CITY OF RIO HONDO · 2,640 people · 2019 | 1/3 | SYR4 |
| Chromium | 1.418 µg/L 1.4% of the EPA limit 100 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.4 µg/L 23% of the EPA limit 6 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/3 | SYR4 |
| Combined Uranium | 1.1 µg/L 3.7% of the EPA limit 30 µg/L Highest in the city: CITY OF RIO HONDO · 2,640 people · 2018 | 1/3 | SYR4 |
| Xylenes, Total | 0.5950 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: CITY OF RIO HONDO · 2,640 people · 2019 | 1/3 | SYR4 |
| Antimony, Total | 0.5323 µg/L 8.9% of the EPA limit 6 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/3 | SYR4 |
| Thallium, Total | 0.3741 µg/L 19% of the EPA limit 2 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/3 | SYR4 |
| Atrazine | 0.1800 µg/L 6% of the EPA limit 3 µg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/3 | SYR4 |
| Pfba | 0.0148 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/3 | UCMR-5 |
| Pfpea | 0.0117 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/3 | UCMR-5 |
| Pfhxa | 0.0112 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/3 | UCMR-5 |
| PFOS | 0.0056 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/3 | UCMR-5 |
| PFOA | 0.0054 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/3 | UCMR-5 |
| PFHXS | 0.0045 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/3 | UCMR-5 |
| Pfhpa | 0.0040 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/3 | UCMR-5 |
| PFBS | 0.0035 µg/L No EPA limit set Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: EAST RIO HONDO WSC · 24,756 people · 2025 | 3/3 | LCR |
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 the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Rio Hondo
| Supplier | Population served |
|---|---|
| EAST RIO HONDO WSC | 24,756 |
| CITY OF RIO HONDO | 2,640 |
| EAST RIO HONDO WSC ARROYO CITY | 1,953 |
Frequently asked questions about Rio Hondo tap water
Is Rio Hondo tap water safe to drink?
EPA testing detected 42 contaminants in the water serving Rio Hondo. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Rio Hondo?
3 public water suppliers report drinking-water monitoring for Rio Hondo, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Rio Hondo's water?
The contaminants EPA monitoring detected in Rio Hondo include Chlorite, Fluoride, Copper, Nitrate, Nitrate-Nitrite. The full list, with the level at the main supplier and the data source, is in the table above.
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.