Drinking water quality · 2023
· Verified
· PWSID CA3610005
What's in Lake Arrowhead Csd — Lake Arrowhead, Ca, CA tap water
2 contaminants in Lake Arrowhead Csd — Lake Arrowhead, Ca, CA's water sat at or above a federal limit, led by PFOA at 3.4x the limit.
- !2 contaminants at or above a federal limit — worst is PFOA at 3.4x
- !1 contaminant within 20% of a limit
- !11 of 27 core regulated contaminants reported — 16 never appear in this report
- ✓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.
- −53 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
- −13 core regulated contaminants never reported (11/27)
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
- PFOA3.4× the federal limit13.75 ng/L · limit 4 ng/L
Linked to cancer, liver damage, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
Higher than 95% of CA systems that report it · higher than 95% of U.S. systems
- PFOS1.5× the federal limit6.1 ng/L · limit 4 ng/L
Linked to cancer, thyroid disease, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
Higher than 60% of CA systems that report it · higher than 70% of U.S. systems
- TTHM82% of the federal limit65.9 ug/L · limit 80 ug/L
Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
Higher than 90% of CA systems that report it · higher than 85% of U.S. systems
+23 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| HAA5 | 25.7 ug/L | 60 ug/L |
| Chlorine | 1.47 mg/L | 4 mg/L |
| Perfluorohexanesulfonic acid | 2.8 ng/L | 10 ng/L |
| Copper | 0.26 mg/L | 1.3 mg/L |
| Gross Alpha | 2.92 pCi/L | 15 pCi/L |
| Turbidity | 0.085 NTU | 1 NTU |
| Nitrate | 0.21 mg/L | 10 mg/L |
| Fluoride | 0 mg/L | 4 mg/L |
| Boron | 100 ug/L | — |
| Calcium | 26 mg/L | — |
| Lead | 0.0 mg/L | 0.015 mg/L |
| Magnesium | 5 mg/L | — |
| Potassium | 2.2 mg/L | — |
| Sodium | 51.38 mg/L | — |
| Vanadium | 3.09 ug/L | — |
| Perfluorobutanesulfonic acid | 5.05 ng/L | 500 ng/L |
| Perfluoroheptanoic acid | 5.4 ng/L | — |
| Perfluorohexanoic acid | 5.45 ng/L | — |
| Bicarbonate | 100 mg/L | — |
| Hardness | 87.69 mg/L | — |
| pH | 8.06 | — |
| TOC | 2.2 | — |
| Uranium | 0.02 pCi/L | 20 pCi/L |
What this report doesn't tell you
16 of the 27 contaminants a community water system normally reports do not appear anywhere in Lake Arrowhead Csd — Lake Arrowhead, 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.