Drinking water quality · 2023
· Verified
What's in Montara Water and Sanitary District — Montara, Ca, CA tap water
19 contaminants were measured in the Montara Water and Sanitary District — Montara, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit — 4 sit at or above that limit.
- Reporting year
- 2023
- Contaminants measured
- 19
- Over federal limit
- 4
- Approaching the limit
- 0
- Worst contaminant
- Perfluorohexanesulfonic acid
- Service area
- CA
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | 0–47 ng/LRangeSystem-wide | 3 ng/LNL | At or above the limit |
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | 0–9.8 ng/LRangeSystem-wide | None set | At or above the limit |
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | 0–6 ng/LRangeSystem-wide | 6.5 ng/LNL | At or above the limit |
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | 0–4 ng/LRangeSystem-wide | 500 ng/LNL | Detected — no federal limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TurbidityA measure of cloudiness from suspended particles in the water. | 1 NTUReported levelSystem-wide | None set | At or above the limit |
| TOCTotal organic carbon — a measure of organic material dissolved in the water. | 0.51–0.71 mg/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. | 0–7.4 mg/LRangeSystem-wide | 10 mg/LMCL | Within the limit |
| Dibromoacetic acidA brominated haloacetic acid disinfection byproduct. | 2.4–6.7 ug/LRangeSystem-wide | 0.03 ug/LPublic health goal | Within the limit |
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0.29–0.34 mg/LRangeSystem-wide | 4 mg/LMCL | Within the limit |
| Dichloroacetic acidA haloacetic acid disinfection byproduct. | 0–2.8 ug/LRangeSystem-wide | 0.2 ug/LPublic health goal | Within the limit |
| Trichloroacetic acidA haloacetic acid disinfection byproduct. | 0–2.3 ug/LRangeSystem-wide | 0.1 ug/LPublic health goal | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 0–7.3 ug/LRangeSystem-wide | None set | Within the limit |
| CopperA metal that enters water from corroding household plumbing. | 0.15 mg/L90th percentileAt the tap | 1.3 mg/LAction level | Within the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | Not detected ug/L90th percentileAt the tap | None set | None detected |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 13–36 ug/LRangeSystem-wide | None set | Within the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 2.4–12 ug/LRangeSystem-wide | None set | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 0–0.12 pCi/LRangeSystem-wide | 5 pCi/LMCL | Within the limit |
Microbial
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Escherichia coli (E. coli)Escherichia coli — bacteria found in the gut of humans and animals. | 0MaximumNo. of detections | 0MCLG | None detected |
+By source (2)— No. of detections, Total No. of Detections
| |||
| Total ColiformA group of bacteria used as an indicator of overall water-system sanitation. | 0MaximumNo. of detections | 0MCLG | None detected |
People also ask about Montara Water and Sanitary District — Montara, Ca, CA's water
+Is Montara Water and Sanitary District — Montara, Ca, CA tap water safe to drink in 2023?
The 2023 Consumer Confidence Report for the Montara Water and Sanitary District — Montara, Ca, CA water utility lists 4 contaminants at or above the federal limit: Perfluorohexanesulfonic acid, PFOA, PFOS, and Turbidity. 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 Montara Water and Sanitary District — Montara, Ca, CA tap water?
19 contaminants were measured in Montara Water and Sanitary District — Montara, Ca, CA's 2023 Consumer Confidence Report, spanning inorganic chemicals, pfas ("forever chemicals"), and metals. 12 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 Montara Water and Sanitary District — Montara, Ca, CA tap water?
4 contaminants in Montara Water and Sanitary District — Montara, Ca, CA's 2023 report sit at or above the federal limit: Perfluorohexanesulfonic acid (4.7× the limit); PFOA (2.5× the limit); PFOS (1.5× the limit); Turbidity (1.0× 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 Montara Water and Sanitary District — Montara, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2023 report is Perfluorohexanesulfonic acid, at 4.7× the federal threshold. It belongs to the pfas ("forever chemicals") family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Montara Water and Sanitary District — Montara, 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 Montara Water and Sanitary District — Montara, 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.