Drinking water quality · 2023
· Verified
· PWSID CA4010007
What's in City of Paso Robles Water Division — Paso Robles, Ca, CA tap water
1 contaminant in City of Paso Robles Water Division — Paso Robles, Ca, CA's water sat at or above a federal limit, led by PFOA at 1.6x the limit.
- !1 contaminant at or above a federal limit — worst is PFOA at 1.6x
- !2 contaminants within 20% of a limit
- !13 of 27 core regulated contaminants reported — 14 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.
- −20 contaminants at or above a federal limit
- −8 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
- −9 core regulated contaminants never reported (13/27)
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
- PFOA1.6× the federal limit0–6.3 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 75% of CA systems that report it · higher than 80% of U.S. systems
- TTHM91% of the federal limit9.3–72.8 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 95% of CA systems that report it · higher than 90% of U.S. systems
- Thallium90% of the federal limit0–1.8 ug/L · limit 2 ug/L
+28 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Nitrate | 0–7 mg/L | 10 mg/L |
| Arsenic | 0–6.1 ug/L | 10 ug/L |
| HAA5 | 2.1–35.2 ug/L | 60 ug/L |
| Chlorine | 0.3–2.2 mg/L | 4 mg/L |
| Perfluorohexanesulfonic acid | 0–5.2 ng/L | 10 ng/L |
| Gross Alpha | 0–7.2 pCi/L | 15 pCi/L |
| Nitrate Nitrite | 0–4.2 mg/L | 10 mg/L |
| Selenium | 0–20 ug/L | 50 ug/L |
| Copper | 0.42 mg/L | 1.3 mg/L |
| Barium | 0–0.33 mg/L | 2 mg/L |
| Turbidity | 0.092 NTU | 1 NTU |
| Fluoride | 0–0.3 mg/L | 4 mg/L |
| Pce | 0–0.17 ug/L | 5 ug/L |
| Boron | 0–790 ug/L | — |
| Calcium | 26–110 mg/L | — |
| Lithium | 0–46.2 ug/L | — |
| Potassium | 1.1–2.8 mg/L | — |
| Sodium | 12–140 mg/L | — |
| Vanadium | 0–48 ug/L | — |
| Perfluorobutanesulfonic acid | 0–8.1 ng/L | — |
| Perfluoroheptanoic acid | 0–6.3 ng/L | — |
| Perfluorohexanoic acid | 0–20 ng/L | — |
| Perfluoropentanoic acid | 0–22 ng/L | — |
| PFBA | 0–6.1000000000000005 ng/L | — |
| Alkalinity | 120–323 mg/L | — |
| Bicarbonate | 140–396.7 mg/L | — |
| Hardness | 8.2–28.7 | — |
| pH | 7.2–8 | — |
What this report doesn't tell you
14 of the 27 contaminants a community water system normally reports do not appear anywhere in City of Paso Robles Water Division — Paso Robles, 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.
- Treatment technique violationHealth-based1 violation on record · most recent Jun 1993resolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗