Drinking water quality · 2023
· Verified
What's in Cotati, City of — Cotati, Ca, CA tap water
37 contaminants were measured in the Cotati, City of — Cotati, 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
- 37
- Over federal limit
- 1
- Approaching the limit
- 0
- Worst contaminant
- Lead
- Service area
- CA
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 23 ug/LRangeSonoma Water | 0.2 ug/LPublic health goal | At or above the limit |
| ArsenicA naturally occurring element that also enters water from industry and agriculture. | 0–3.1 ug/LRangeCity Of Cotati | 0.004 ug/LPublic health goal | Within the limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| SeleniumA trace element from natural deposits and industrial discharge. | 0–6.4 ug/LRangeCity Of Cotati | 30 ug/LPublic health goal | Within the limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| BariumA metal from erosion of natural deposits and industrial discharge. | 0.12–0.2 mg/LRangeCity Of Cotati | 2 mg/LPublic health goal | Within the limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| CalciumA naturally occurring mineral that contributes to water hardness. | 23–46 mg/LRangeCity Of Cotati | None set | Detected — no federal limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| IronA naturally occurring metal common in groundwater. | 0–620 ug/LRangeSonoma Water | None set | Detected — no federal limit |
+By source (2)— Sonoma Water, City Of Cotati
| |||
| LithiumA naturally occurring element found in some groundwater. | 14–32 ug/LRangeCity Of Cotati | 9 ug/LPublic health goal | Detected — no federal limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| ManganeseA naturally occurring metal from soil and rock. | 0–110 ug/LRangeSonoma Water | None set | Detected — no federal limit |
+By source (2)— Sonoma Water, City Of Cotati
| |||
| SodiumA naturally occurring salt component. | 8.8–46 mg/LRangeSonoma Water | None set | Detected — no federal limit |
+By source (2)— Sonoma Water, City Of Cotati
| |||
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. | 11.99–12.46 ug/LRangeSonoma Water | None set | Within the limit |
+By source (2)— Sonoma Water, City Of Cotati
| |||
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 0.73–1.8 pCi/LRangeCity Of Cotati | 0 pCi/LPublic health goal | Within the limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| FluorideA mineral often added to drinking water to help prevent tooth decay. | 0–0.25 mg/LRangeCity Of Cotati | 1 mg/LPublic health goal | Within the limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | Not detected mg/LReported levelCity Of Cotati | 10 mg/LPublic health goal | None detected |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| ChlorideA naturally occurring salt compound. | 39–68 mg/LRangeCity Of Cotati | None set | Detected — no federal limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| SulfateA naturally occurring mineral from rock and soil. | 9–34 mg/LRangeCity Of Cotati | None set | Detected — no federal limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
Other
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chromium | 0–1 ug/LRangeCity Of Cotati | 0.02 ug/LPublic health goal | Within the limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
PFAS ("forever chemicals")
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Hexafluoropropylene oxide dimer acidHFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound. | Not detected ug/LReported levelSonoma Water | 0.005 ug/LPublic health goal | None detected |
+By source (2)— Sonoma Water, City Of Cotati
| |||
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)N-ethyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound. | Not detected ug/LReported levelSonoma Water | 0.005 ug/LPublic health goal | None detected |
+By source (2)— Sonoma Water, City Of Cotati
| |||
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)N-methyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound. | Not detected ug/LReported levelCity Of Cotati | 0.006 ug/LPublic health goal | None detected |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| Perfluorodecanoic acid (PFDA)Perfluorodecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detected ug/LReported levelCity Of Cotati | 0.003 ug/LPublic health goal | None detected |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| Perfluorododecanoic acid (PFDoA)Perfluorododecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detected ug/LReported levelCity Of Cotati | 0.003 ug/LPublic health goal | None detected |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| Perfluoroheptanesulfonic acid (PFHpS)Perfluoroheptanesulfonic acid, a PFAS 'forever chemical.' | Not detected ug/LReported levelSonoma Water | 0.003 ug/LPublic health goal | None detected |
+By source (2)— Sonoma Water, City Of Cotati
| |||
| Perfluoropentanesulfonic acid (PFPeS)Perfluoropentanesulfonic acid, a PFAS 'forever chemical.' | Not detected ug/LReported levelCity Of Cotati | 0.004 ug/LPublic health goal | None detected |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| Perfluorotetradecanoic acid (PFTeDA)Perfluorotetradecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detected ug/LReported levelSonoma Water | 0.008 ug/LPublic health goal | None detected |
+By source (2)— Sonoma Water, City Of Cotati
| |||
| Perfluorotridecanoic acid (PFTrDA)Perfluorotridecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detected ug/LReported levelSonoma Water | 0.007 ug/LPublic health goal | None detected |
+By source (2)— Sonoma Water, City Of Cotati
| |||
| Perfluoroundecanoic acid (PFUnA)Perfluoroundecanoic acid, a longer-chain PFAS 'forever chemical.' | Not detected ug/LReported levelSonoma Water | 0.002 ug/LPublic health goal | None detected |
+By source (2)— Sonoma Water, City Of Cotati
| |||
| PFAS | Not detected ug/LReported levelSonoma Water | 0.003 ug/LPublic health goal | None detected |
+By source (2)— Sonoma Water, City Of Cotati
| |||
| PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.' | Not detected ug/LReported levelSonoma Water | 0.005 ug/LPublic health goal | None detected |
+By source (2)— Sonoma Water, City Of Cotati
| |||
| PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products. | Not detected ug/LReported levelCity Of Cotati | 0.004 ug/LPublic health goal | None detected |
+By source (2)— City Of Cotati, Sonoma Water
| |||
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| AlkalinityA measure of the water's capacity to neutralize acids. | 120–140 mg/LRangeCity Of Cotati | None set | Detected — no federal limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| Bicarbonate | 150–200 mg/LRangeCity Of Cotati | None set | Detected — no federal limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| ColorA measure of visible tint in the water. | 0–12RangeSonoma Water | None set | Detected — no federal limit |
+By source (2)— Sonoma Water, City Of Cotati
| |||
| HardnessA measure of dissolved calcium and magnesium minerals. | 98–220 mg/LRangeCity Of Cotati | None set | Detected — no federal limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| OdorA measure of detectable smell in the water. | 0–7.1RangeSonoma Water | None set | Detected — no federal limit |
+By source (2)— Sonoma Water, City Of Cotati
| |||
| pHA measure of how acidic or basic the water is. | 7.15–8.38RangeSonoma Water | None set | Detected — no federal limit |
+By source (2)— Sonoma Water, City Of Cotati
| |||
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 330–490RangeCity Of Cotati | None set | Detected — no federal limit |
+By source (2)— City Of Cotati, Sonoma Water
| |||
| TurbidityA measure of cloudiness from suspended particles in the water. | 0–7.2RangeSonoma Water | 5MCL | Detected — no federal limit |
+By source (2)— Sonoma Water, City Of Cotati
| |||
People also ask about Cotati, City of — Cotati, Ca, CA's water
+Is Cotati, City of — Cotati, Ca, CA tap water safe to drink in 2023?
The 2023 Consumer Confidence Report for the Cotati, City of — Cotati, Ca, CA water utility lists 1 contaminant at or above the federal limit: Lead. 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 Cotati, City of — Cotati, Ca, CA tap water?
37 contaminants were measured in Cotati, City of — Cotati, Ca, CA's 2023 Consumer Confidence Report, spanning pfas ("forever chemicals"), metals, and physical & aggregate. 23 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 Cotati, City of — Cotati, Ca, CA tap water?
One contaminant in Cotati, City of — Cotati, Ca, CA's 2023 report sits at or above the federal limit: Lead (1.5× 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 Cotati, City of — Cotati, Ca, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2023 report is Lead, at 1.5× the federal threshold. It belongs to the metals family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Cotati, City of — Cotati, 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 Cotati, City of — Cotati, 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.