Drinking water quality · 2023
· Verified
What's in City of Paso Robles Water Division — Paso Robles, Ca, CA tap water
31 contaminants were measured in the City of Paso Robles Water Division — Paso Robles, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit — 1 sit at or above that limit.
- Reporting year
- 2023
- Contaminants measured
- 31
- Over federal limit
- 1
- Approaching the limit
- 2
- Worst contaminant
- PFOA
- Service area
- CA
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 0–0.0063 ug/LRangeSystem-wide | None set | At or above the limit |
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | 0–0.0052 ug/LRangeSystem-wide | None set | Within the limit |
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | 0–0.0081 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.' | 0–0.0063 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.' | 0–0.02 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.' | 0–0.022 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.' | 0–0.0061 ug/LRangeSystem-wide | None set | Detected — no federal limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 9.3–72.8 ug/LRangeSystem-wide | None set | Approaching the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 2.1–35.2 ug/LRangeSystem-wide | None set | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Thallium | 0–1.8 ug/LRangeSystem-wide | None set | Approaching the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 0–6.1 ug/LRangeSystem-wide | None set | Within the limit |
| SeleniumA trace element from natural deposits and industrial discharge. | 0–20 ug/LRangeSystem-wide | None set | Within the limit |
| CopperA metal that enters water from corroding household plumbing. | 0.42 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| BariumA metal from erosion of natural deposits and industrial discharge. | 0–0.33 mg/LRangeSystem-wide | 2 mg/LMCL | Within the limit |
| BoronA naturally occurring element from rock and soil. | 0–790 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| CalciumA naturally occurring mineral that contributes to water hardness. | 26–110 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| LithiumA naturally occurring element found in some groundwater. | 0–46.2 ug/LRangeSystem-wide | None set | Detected — no federal limit |
| PotassiumA naturally occurring mineral from rock and soil. | 1.1–2.8 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| SodiumA naturally occurring salt component. | 12–140 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| Vanadium | 0–48 ug/LRangeSystem-wide | None set | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 0–7 mg/LRangeSystem-wide | 10 mg/LMCL | Within the limit |
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0–0.3 mg/LRangeSystem-wide | 4 mg/LMCL | Within the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 0.3–2.2 mg/LRangeSystem-wide | None set | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 0–7.2 pCi/LRangeSystem-wide | 15 pCi/LMCL | Within the limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Nitrate Nitrite | 0–4.2 mg/LRangeSystem-wide | 10 mg/LMCL | Within the limit |
| Pce | 0–0.17 ug/LRangeSystem-wide | None set | Within the limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| AlkalinityA measure of the water's capacity to neutralize acids. | 120–323 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| Bicarbonate | 140–396.7 mg/LRangeSystem-wide | None set | Detected — no federal limit |
| HardnessA measure of dissolved calcium and magnesium minerals. | 8.2–28.7RangeSystem-wide | None set | Detected — no federal limit |
| pHA measure of how acidic or basic the water is. | 7.2–8RangeSystem-wide | None set | Detected — no federal limit |
| TurbidityA measure of cloudiness from suspended particles in the water. | 100Reported levelSystem-wide | None set | Detected — no federal limit |
People also ask about City of Paso Robles Water Division — Paso Robles, Ca, CA's water
+Is City of Paso Robles Water Division — Paso Robles, Ca, CA tap water safe to drink in 2023?
The 2023 Consumer Confidence Report for the City of Paso Robles Water Division — Paso Robles, Ca, CA water utility lists 1 contaminant at or above the federal limit: PFOA. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in City of Paso Robles Water Division — Paso Robles, Ca, CA tap water?
31 contaminants were measured in City of Paso Robles Water Division — Paso Robles, Ca, CA's 2023 Consumer Confidence Report, spanning metals, pfas ("forever chemicals"), and physical & aggregate. 6 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in City of Paso Robles Water Division — Paso Robles, Ca, CA tap water?
One contaminant in City of Paso Robles Water Division — Paso Robles, Ca, CA's 2023 report sits at or above the federal limit: PFOA (1.6× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in City of Paso Robles Water Division — Paso Robles, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2023 report is PFOA, at 1.6× the federal threshold. It belongs to the pfas ("forever chemicals") family of contaminants.
+Are any contaminants in City of Paso Robles Water Division — Paso Robles, Ca, CA tap water approaching the federal limit?
2 contaminants are between 80% and 100% of the federal limit in this report: TTHM and Thallium. Approaching means measured but not in violation — a margin that can close quickly if conditions change.
+Where does the data on this page come from?
Every value is transcribed from City of Paso Robles Water Division — Paso Robles, Ca, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is City of Paso Robles Water Division — Paso Robles, Ca, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2023 report; a new report will replace it once the utility publishes its next annual update.