Drinking water quality · 2023
· Verified
· PWSID CA0410008
What's in Thermalito Water & Sewer Dist — Oroville, Ca, CA tap water
Every one of the 16 core regulated contaminants reported for Thermalito Water & Sewer Dist — Oroville, Ca, CA came in below its federal limit.
- !1 contaminant within 20% of a limit
- !16 of 27 core regulated contaminants reported — 11 never appear in this report
- ✓Nothing over a federal limit
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −0 contaminants at or above a federal limit
- −4 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −2 health-based violations resolved in the last 5 years
- −5 core regulated contaminants never reported (16/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →What to worry about
- HAA583% of the federal limit35–50 ug/L · limit 60 ug/L
Long-term exposure above the federal limit is associated with an increased cancer risk.
Higher than 95% of CA systems that report it · higher than 90% of U.S. systems
+23 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| TTHM | 35–44 ug/L | 80 ug/L |
| Arsenic | 0–4 ug/L | 10 ug/L |
| Nitrate | 0–2.7 mg/L | 10 mg/L |
| Chlorine | 0.72–0.92 mg/L | 4 mg/L |
| Fluoride | 0–0.4 mg/L | 4 mg/L |
| Perchlorate | Not detected ug/L | — |
| Nitrite | Not detected mg/L | 1 mg/L |
| Aluminum | Not detected mg/L | — |
| Antimony | Not detected ug/L | 6 ug/L |
| Barium | Not detected ug/L | 2000 ug/L |
| Beryllium | Not detected ug/L | 4 ug/L |
| Cadmium | Not detected ug/L | 5 ug/L |
| Copper | Not detected ug/L | 1300 ug/L |
| Lead | Not detected ug/L | 15 ug/L |
| Manganese | 0–20 ug/L | — |
| Mercury | Not detected ug/L | 2 ug/L |
| Nickel | Not detected ug/L | — |
| Selenium | Not detected ug/L | 50 ug/L |
| Sodium | 11–29 mg/L | — |
| Thallium | Not detected ug/L | 2 ug/L |
| Escherichia coli (E. coli) | 0 | 0 |
| Total Coliform | 0 | 0 |
| Chromium | Not detected ug/L | 100 ug/L |
What this report doesn't tell you
11 of the 27 contaminants a community water system normally reports do not appear anywhere in Thermalito Water & Sewer Dist — Oroville, Ca, CA's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
- Maximum contaminant level exceededHealth-based2 violations on record · most recent Mar 2020resolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗