Drinking water quality · 2023
· Verified
· PWSID CA3610002
What's in Alpine Water Users Association — Twin Peaks, Ca, CA tap water
Only 9 of 27 core regulated contaminants were reported for Alpine Water Users Association — Twin Peaks, Ca, CA. What was measured is clean — but most of the picture is missing.
- !1 contaminant within 20% of a limit
- !9 of 27 core regulated contaminants reported — 18 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
- −0 health-based violations resolved in the last 5 years
- −16 core regulated contaminants never reported (9/27)
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
- Copper92% of the federal limit1.2 mg/L · limit 1.3 mg/L
Short-term exposure causes stomach distress; long-term exposure can damage the liver and kidneys.
Higher than 95% of CA systems that report it · higher than 95% of U.S. systems
+8 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| TTHM | 21.6 ug/L | 80 ug/L |
| Gross Alpha | 3.1 pCi/L | 15 pCi/L |
| Chlorine | 0.74 mg/L | 4 mg/L |
| Nitrate | 0.59 mg/L | 10 mg/L |
| HAA5 | 1.7 ug/L | 60 ug/L |
| Lead | 0.0 mg/L | 0.015 mg/L |
| Escherichia coli (E. coli) | 4 | — |
| Uranium | 3.4 pCi/L | 20 pCi/L |
What this report doesn't tell you
18 of the 27 contaminants a community water system normally reports do not appear anywhere in Alpine Water Users Association — Twin Peaks, 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-based3 violations on record · most recent Jul 2011resolved
- Monitoring1 violation on recordresolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗