Drinking water quality · 2023
· Verified
· PWSID CA3310049
What's in Western MWD — Riverside, Ca, CA tap water
2 contaminants in Western MWD — Riverside, Ca, CA's water sat at or above a federal limit, led by Copper at 1.0x the limit.
- !2 contaminants at or above a federal limit — worst is Copper at 1.0x
- !17 of 27 core regulated contaminants reported — 10 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.
- −24 contaminants at or above a federal limit
- −0 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
- −3 core regulated contaminants never reported (17/27)
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
- Copper1.0× the federal limit1.3 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
- Lead1.0× the federal limit15 ug/L · limit 15 ug/L
There is no safe level of lead; it harms brain development in children and raises blood pressure in adults. The EPA sets an action level, not a health goal above zero.
Higher than 95% of CA systems that report it · higher than 95% of U.S. systems
+50 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Bromate | 7.9 ug/L | 10 ug/L |
| Turbidity | 0.74 NTU | 1 NTU |
| TTHM | 42 ug/L | 80 ug/L |
| Nitrate | 5 mg/L | 10 mg/L |
| Chloramine | 1.97 mg/L | 4 mg/L |
| Gross Alpha | 3.5 pCi/L | 15 pCi/L |
| HAA5 | 13 ug/L | 60 ug/L |
| Arsenic | 2 ug/L | 10 ug/L |
| Fluoride | 0.7 mg/L | 4 mg/L |
| Barium | 0.1 mg/L | 2 mg/L |
| Chlorodibromoacetic acid | 0.08 ug/L | 60 ug/L |
| Chlorate | 80 ug/L | 800 ug/L |
| NDMA | 2.5 ng/L | 10 ng/L |
| Perchlorate | 1.3 ug/L | — |
| Chloride | 96 mg/L | — |
| Nitrite | Not detected mg/L | 1 mg/L |
| Sulfate | 199 mg/L | — |
| Aluminum | 74 ug/L | — |
| Boron | 130 ug/L | 1000 ug/L |
| Calcium | 62 mg/L | — |
| Chromium, Hexavalent | 1.2 ug/L | — |
| Germanium | Not detected ug/L | — |
| Iron | Not detected ug/L | — |
| Lithium | 28 ug/L | — |
| Magnesium | 22 mg/L | — |
| Manganese | Not detected ug/L | — |
| Potassium | 4.8 mg/L | — |
| Selenium | Not detected ug/L | 50 ug/L |
| Silica | 14 mg/L | — |
| Sodium | 93 mg/L | — |
| Vanadium | Not detected ug/L | 50 ug/L |
| Total Coliform | 1 % | — |
| Perfluorobutanesulfonic acid | Not detected ng/L | 500 ng/L |
| Perfluorohexanesulfonic acid | Not detected ng/L | 10 ng/L |
| Perfluorohexanoic acid | Not detected ng/L | — |
| Perfluoropentanoic acid | Not detected ng/L | — |
| PFBA | Not detected ng/L | — |
| PFOA | Not detected ng/L | 4 ng/L |
| PFOS | Not detected ng/L | 4 ng/L |
| Alkalinity | 117 mg/L | — |
| Color | Not detected | — |
| Hardness | 242 mg/L | — |
| Odor | Not detected | — |
| pH | 8.6 | — |
| Specific Conductance | 910 | — |
| TOC | 2.6 mg/L | — |
| Total Dissolved Solids | 566 mg/L | — |
| Combined Radium | Not detected pCi/L | 5 pCi/L |
| Gross Beta Particle Activity | 12 pCi/L | — |
| Uranium | 3.4 pCi/L | 20 pCi/L |
What this report doesn't tell you
10 of the 27 contaminants a community water system normally reports do not appear anywhere in Western MWD — Riverside, 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.