What was found in Twain Harte'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 |
|---|---|---|---|
| Nitrate-Nitrite | 981.45 µg/L 9.8% of the EPA limit 10000 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2017
Highest in the city: 428610 µg/L — LEISURE PINES MUTUAL WATER CO · 340 people · 2016 | 2/5 | SYR4 |
| Nitrate | 900 µg/L 9% of the EPA limit 10000 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019
Highest in the city: 3706.4 µg/L — LEISURE PINES MUTUAL WATER CO · 340 people · 2019 | 4/5 | SYR4 |
| Fluoride | 697.9 µg/L 17% of the EPA limit 4000 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 4/5 | SYR4 |
| Toluene | 3.189 µg/L 0.3% of the EPA limit 1000 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019
Highest in the city: 301.95 µg/L — LEISURE PINES MUTUAL WATER CO · 340 people · 2018 | 2/5 | SYR4 |
| Barium | 86.12 µg/L 4.3% of the EPA limit 2000 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019
Highest in the city: 105.38 µg/L — LEISURE PINES MUTUAL WATER CO · 340 people · 2019 | 3/5 | SYR4 |
| TTHM | 74.78 µg/L 93% of the EPA limit 80 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 2/5 | SYR4 |
| Chloroform | 72.62 µg/L No EPA limit set Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 2/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 46.82 µg/L 78% of the EPA limit 60 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019
Highest in the city: 47.51 µg/L — TWAIN HARTE VALLEY MWC · 202 people · 2019 | 2/5 | SYR4 |
| Trichloroacetic Acid | 27.765 µg/L No EPA limit set Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019
Highest in the city: 29.25 µg/L — TWAIN HARTE VALLEY MWC · 202 people · 2019 | 2/5 | SYR4 |
| Dichloroacetic Acid | 17.875 µg/L No EPA limit set Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019
Highest in the city: 18.09 µg/L — TWAIN HARTE VALLEY MWC · 202 people · 2019 | 2/5 | SYR4 |
| Combined Uranium | 17.0218 µg/L 57% of the EPA limit 30 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 2/5 | SYR4 |
| Monobromoacetic Acid | 13.5435 µg/L No EPA limit set Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 2/5 | SYR4 |
| Dichloromethane | 2.094 µg/L 42% of the EPA limit 5 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019
Highest in the city: 12.174 µg/L — SIERRA VILLAGE MUTUAL WATER CO · 361 people · 2018 | 2/5 | SYR4 |
| Arsenic | 2.3 µg/L 23% of the EPA limit 10 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019
Highest in the city: 11.28 µg/L — SIERRA VILLAGE MUTUAL WATER CO · 361 people · 2017 | 2/5 | SYR4 |
| Chromium | 11.1 µg/L 11% of the EPA limit 100 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 1/5 | SYR4 |
| Thallium, Total | 7.8 µg/L 390% of the EPA limit, at the 95th percentile of samples — 2 µg/L Highest in the city: LEISURE PINES MUTUAL WATER CO · 340 people · 2019 | 1/5 | SYR4 |
| Selenium | 7.6 µg/L 15% of the EPA limit 50 µg/L Highest in the city: LEISURE PINES MUTUAL WATER CO · 340 people · 2019 | 1/5 | SYR4 |
| Monochloroacetic Acid | 7.5305 µg/L No EPA limit set Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 2/5 | SYR4 |
| Beryllium, Total | 3.3 µg/L 83% of the EPA limit 4 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 1/5 | SYR4 |
| Dibromoacetic Acid | 2.93 µg/L No EPA limit set Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 1/5 | SYR4 |
| Cadmium | 2.8 µg/L 56% of the EPA limit 5 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 2/5 | SYR4 |
| Bromodichloromethane | 1.95 µg/L No EPA limit set Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 2/5 | SYR4 |
| Dibromochloromethane | 1.32815 µg/L No EPA limit set Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 1/5 | SYR4 |
| Combined Radium (-226 And -228) | 0.3940 pCi/L 7.9% of the EPA limit 5 pCi/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 1/5 | SYR4 |
| Nitrite | 0.2740 µg/L 0% of the EPA limit 1000 µg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2019 | 1/5 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: TWAIN HARTE COMMUNITY SERVICES DISTRICT · 2,378 people · 2024
Highest in the city: 0.0126 mg/L — LEISURE PINES MUTUAL WATER CO · 340 people · 2022 | 5/5 | 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 Twain Harte
| Supplier | Population served |
|---|---|
| TWAIN HARTE COMMUNITY SERVICES DISTRICT | 2,378 |
| SIERRA VILLAGE MUTUAL WATER CO | 361 |
| LEISURE PINES MUTUAL WATER CO | 340 |
| SUGAR PINE RV RESORT | 219 |
| TWAIN HARTE VALLEY MWC | 202 |
Frequently asked questions about Twain Harte tap water
Is Twain Harte tap water safe to drink?
EPA testing detected 26 contaminants in the water serving Twain Harte. 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 Twain Harte?
5 public water suppliers report drinking-water monitoring for Twain Harte, California to the EPA. Each is listed above with its population served.
What contaminants are in Twain Harte's water?
The contaminants EPA monitoring detected in Twain Harte include Nitrate-Nitrite, Nitrate, Fluoride, Toluene, Barium. 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.