What was found in Joshua'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 |
|---|---|---|---|
| Fluoride | 1987 µg/L 50% of the EPA limit 4000 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2018 | 2/2 | SYR4 |
| Nitrate | 679 µg/L 6.8% of the EPA limit 10000 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 333 µg/L 3.3% of the EPA limit 10000 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 2/2 | SYR4 |
| Copper | 195 µg/L 15% of the EPA limit 1300 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2018 | 2/2 | SYR4 |
| Lithium | 65.6 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2025 | 1/2 | UCMR-5 |
| TTHM | 60.205 µg/L 75% of the EPA limit 80 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 2/2 | SYR4 |
| Barium | 59.3 µg/L 3% of the EPA limit 2000 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 2/2 | SYR4 |
| Chloroform | 42.125 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 34.96 µg/L 58% of the EPA limit 60 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 2/2 | SYR4 |
| Cyanide | 20.8 µg/L 10% of the EPA limit 200 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2017 | 1/2 | SYR4 |
| Dichloroacetic Acid | 18.595 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 15.9285 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 13.195 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 11.01 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 2/2 | SYR4 |
| Bromoform | 10.223 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 2/2 | SYR4 |
| Lead | 8.35 µg/L 56% of the EPA limit 15 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2018 | 1/2 | SYR4 |
| Monobromoacetic Acid | 6.905 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 6.14 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 5 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 1/2 | SYR4 |
| Chromium | 3.59 µg/L 3.6% of the EPA limit 100 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 2/2 | SYR4 |
| Xylenes, Total | 3.07 µg/L 0% of the EPA limit 10000 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 1/2 | SYR4 |
| Arsenic | 1.58 µg/L 16% of the EPA limit 10 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2017 | 2/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.9640 µg/L 16% of the EPA limit 6 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Adipate | 0.0422 µg/L 0% of the EPA limit 400 µg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0138 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2025 | 1/2 | UCMR-5 |
| Pfpea | 0.0050 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2025 | 1/2 | UCMR-5 |
| Pfhxa | 0.0045 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2025 | 1/2 | UCMR-5 |
| PFBS | 0.0034 µg/L No EPA limit set Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0027 mg/L 18% of the EPA limit 0.0150 mg/L Main supplier: JOHNSON COUNTY SUD · 65,517 people · 2025 | 2/2 | 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 Joshua
| Supplier | Population served |
|---|---|
| JOHNSON COUNTY SUD | 65,517 |
| NORTH WHISPERING MEADOWS WATER | 66 |
Frequently asked questions about Joshua tap water
Is Joshua tap water safe to drink?
EPA testing detected 30 contaminants in the water serving Joshua. 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 Joshua?
2 public water suppliers report drinking-water monitoring for Joshua, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Joshua's water?
The contaminants EPA monitoring detected in Joshua include Fluoride, Nitrate, Nitrate-Nitrite, Copper, Lithium. 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.