Drinking water quality · 2021
· Verified
What's in City of Millbrae — Millbrae, Ca, CA tap water
16 contaminants were measured in the City of Millbrae — Millbrae, Ca, CA water system's 2021 annual report. Each is shown below against its federal limit — 1 sit at or above that limit.
- Reporting year
- 2021
- Contaminants measured
- 16
- Over federal limit
- 1
- Approaching the limit
- 0
- Worst contaminant
- Nitrate
- Service area
- CA
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | 12 mg/LAverageSystem-wide | 10 mg/LMCL | At or above the limit |
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.3 mg/LAverageSystem-wide | 4 mg/LMCL | Within the limit |
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ChlorineA disinfectant added to drinking water to kill bacteria and viruses. | 3 mg/LAverageSystem-wide | 4 mg/LMCL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 11 ug/L90th percentileAt the tap | None set | Within the limit |
| CopperA metal that enters water from corroding household plumbing. | 145 ug/L90th percentileAt the tap | None set | Within the limit |
| ManganeseA naturally occurring metal from soil and rock. | 5.5 ug/LAverageSystem-wide | None set | Detected — no federal limit |
| NickelA metal from natural deposits and industrial discharge. | Not detected ug/LAverageSystem-wide | None set | Detected — no federal limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 23 ug/LAverageSystem-wide | None set | Within the limit |
| BromateA disinfection byproduct formed when bromide-containing water is treated with ozone. | 1.3 ug/LAverageSystem-wide | None set | Within the limit |
| PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection. | Not detected ug/LAverageSystem-wide | None set | Detected — no federal limit |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium | 21 ug/LAverageSystem-wide | 0.02 ug/LPublic health goal | Within the limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0AverageSystem-wide | None set | None detected |
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0AverageSystem-wide | None set | None detected |
| Giardia lamblia | 0.01AverageSystem-wide | None set | Detected — no federal limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 2.3 mg/LAverageSystem-wide | None set | Detected — no federal limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | Not detected pCi/LAverageSystem-wide | 20 pCi/LMCL | Detected — no federal limit |
People also ask about City of Millbrae — Millbrae, Ca, CA's water
+Is City of Millbrae — Millbrae, Ca, CA tap water safe to drink in 2021?
The 2021 Consumer Confidence Report for the City of Millbrae — Millbrae, Ca, CA water utility lists 1 contaminant at or above the federal limit: Nitrate. 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 Millbrae — Millbrae, Ca, CA tap water?
16 contaminants were measured in City of Millbrae — Millbrae, Ca, CA's 2021 Consumer Confidence Report, spanning metals, disinfection byproducts, and microbial. 5 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 Millbrae — Millbrae, Ca, CA tap water?
One contaminant in City of Millbrae — Millbrae, Ca, CA's 2021 report sits at or above the federal limit: Nitrate (1.2× 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 Millbrae — Millbrae, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2021 report is Nitrate, at 1.2× the federal threshold. It belongs to the inorganic chemicals family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from City of Millbrae — Millbrae, Ca, CA's 2021 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 Millbrae — Millbrae, 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 2021 report; a new report will replace it once the utility publishes its next annual update.