Drinking water quality · 2023
What's in Muscoy Mwc No. 1 — San Bernardino, Ca, CA tap water
13 contaminants were measured in the Muscoy Mwc No. 1 — San Bernardino, 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
- 13
- Over federal limit
- 1
- Approaching the limit
- 0
- Worst contaminant
- HAA5
- Service area
- CA
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 Nov 2009resolved
- Monitoring1 violation on recordresolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 1 mg/LReported levelSystem-wide | None set | At or above the limit |
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 0–15.4 ug/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. | 0–6 pCi/LRangeSystem-wide | 15 pCi/LMCL | Within the limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | 0–3.1 pCi/LRangeSystem-wide | 15 pCi/LMCL | Detected — no federal limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 3–3.4 mg/LRangeSystem-wide | 10 mg/LMCL | Within the limit |
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.42–0.55 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. | 0.39–0.64 mg/LRangeSystem-wide | 4 mg/LMCL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0.13 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| BoronA naturally occurring element from rock and soil. | Not detected ug/LReported levelSystem-wide | 1000 ug/LNL | None detected |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 0.0 mg/L90th percentileAt the tap | 0.015 mg/LAction level | None detected |
| Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium. | 0–1.3RangeSystem-wide | None set | Detected — no federal limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0Highest single sampleNo. of Detections | None set | None detected |
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0Highest single sampleNo. of Detections | None set | None detected |
People also ask about Muscoy Mwc No. 1 — San Bernardino, Ca, CA's water
+Is Muscoy Mwc No. 1 — San Bernardino, Ca, CA tap water safe to drink in 2023?
The 2023 Consumer Confidence Report for the Muscoy Mwc No. 1 — San Bernardino, Ca, CA water utility lists 1 contaminant at or above the federal limit: HAA5. 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 Muscoy Mwc No. 1 — San Bernardino, Ca, CA tap water?
13 contaminants were measured in Muscoy Mwc No. 1 — San Bernardino, Ca, CA's 2023 Consumer Confidence Report, spanning metals, disinfection byproducts, and inorganic chemicals. 8 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 Muscoy Mwc No. 1 — San Bernardino, Ca, CA tap water?
One contaminant in Muscoy Mwc No. 1 — San Bernardino, Ca, CA's 2023 report sits at or above the federal limit: HAA5 (16.7× 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 Muscoy Mwc No. 1 — San Bernardino, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2023 report is HAA5, at 16.7× the federal threshold. It belongs to the disinfection byproducts family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Muscoy Mwc No. 1 — San Bernardino, 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 Muscoy Mwc No. 1 — San Bernardino, 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.