Drinking water quality · 2023
What's in North Marin Water District — Novato, Ca, CA tap water
17 contaminants were measured in the North Marin Water District — Novato, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit.
- Reporting year
- 2023
- Contaminants measured
- 17
- Over federal limit
- 0
- Approaching the limit
- 1
- 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-based1 violation on record · most recent Jul 1993resolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. | 0–73 ug/LRangeSonoma County Water Agency | None set | Approaching the limit |
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 0–37 ug/LRangeSonoma County Water Agency | None set | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| CopperA metal that enters water from corroding household plumbing. | 0–260 ug/L90th percentileSonoma County Water Agency | 300 ug/LPublic health goal | Within the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | Not detected ug/LAverageSonoma County Water Agency | 0.004 ug/LPublic health goal | Within the limit |
+By source (2)— Stafford Water Treatment Plant, Sonoma County Water Agency
| |||
| BariumA metal from erosion of natural deposits and industrial discharge. | Not detected mg/LAverageSonoma County Water Agency | 2 mg/LPublic health goal | Within the limit |
+By source (2)— Stafford Water Treatment Plant, Sonoma County Water Agency
| |||
| 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 |
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chlorine Free | 0.73 mg/LAverageSonoma County Water Agency | None set | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | Not detected mg/LAverageSonoma County Water Agency | 1 mg/LPublic health goal | Within the limit |
+By source (2)— Stafford Water Treatment Plant, Sonoma County Water Agency
| |||
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | Not detected mg/LAverageSonoma County Water Agency | 10 mg/LPublic health goal | None detected |
+By source (2)— Sonoma County Water Agency, Stafford Water Treatment Plant
| |||
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Hexafluoropropylene oxide dimer acidHFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound. | Not detected ng/LAverageNorth Marin Water District | 10 ng/LMCLG | None detected |
| Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.' | Not detected ng/LAverageNorth Marin Water District | 500 ng/LNL | None detected |
| Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.' | Not detected ng/LAverageNorth Marin Water District | None set | None detected |
| Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.' | Not detected ng/LAverageNorth Marin Water District | 3 ng/LNL | None detected |
| Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.' | Not detected ng/LAverageNorth Marin Water District | 10 ng/LMCLG | None detected |
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | Not detected ng/LAverageNorth Marin Water District | 5.1 ng/LNL | None detected |
| PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. | Not detected ng/LAverageNorth Marin Water District | 6.5 ng/LNL | None detected |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | Not detected pCi/LAverageSonoma County Water Agency | 0 pCi/LPublic health goal | None detected |
+By source (2)— Sonoma County Water Agency, Stafford Water Treatment Plant
| |||
People also ask about North Marin Water District — Novato, Ca, CA's water
+Is North Marin Water District — Novato, Ca, CA tap water safe to drink in 2023?
Every one of the 17 contaminants measured in North Marin Water District — Novato, Ca, CA's 2023 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in North Marin Water District — Novato, Ca, CA tap water?
17 contaminants were measured in North Marin Water District — Novato, Ca, CA's 2023 Consumer Confidence Report, spanning pfas ("forever chemicals"), metals, and disinfection byproducts. 13 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Are any contaminants in North Marin Water District — Novato, Ca, CA tap water approaching the federal limit?
One contaminant is between 80% and 100% of the federal limit in this report: TTHM. 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 North Marin Water District — Novato, 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 North Marin Water District — Novato, 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.