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
1.5× the limit
Service area
CA
state-level CCR
Source
Utility CCR

Metals

ContaminantMeasuredStatus
LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures.23 ug/LRangeSonoma WaterAt or above the limit
ArsenicA naturally occurring element that also enters water from industry and agriculture.0–3.1 ug/LRangeCity Of CotatiWithin the limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range0–3.1 ug/L31% of limit
  • Sonoma WaterZone
    0% of limit
SeleniumA trace element from natural deposits and industrial discharge.0–6.4 ug/LRangeCity Of CotatiWithin the limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range0–6.4 ug/L13% of limit
  • Sonoma WaterZone
    0% of limit
BariumA metal from erosion of natural deposits and industrial discharge.0.12–0.2 mg/LRangeCity Of CotatiWithin the limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range0.12–0.2 mg/L10% of limit
  • Sonoma WaterZone
    range0–0.11 mg/L6% of limit
CalciumA naturally occurring mineral that contributes to water hardness.23–46 mg/LRangeCity Of CotatiDetected — no federal limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range23–46 mg/L
  • Sonoma WaterZone
    range9–26 mg/L
IronA naturally occurring metal common in groundwater.0–620 ug/LRangeSonoma WaterDetected — no federal limit
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    range0–620 ug/L
  • City Of CotatiZone
LithiumA naturally occurring element found in some groundwater.14–32 ug/LRangeCity Of CotatiDetected — no federal limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range14–32 ug/L
  • Sonoma WaterZone
ManganeseA naturally occurring metal from soil and rock.0–110 ug/LRangeSonoma WaterDetected — no federal limit
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    range0–110 ug/L
  • City Of CotatiZone
SodiumA naturally occurring salt component.8.8–46 mg/LRangeSonoma WaterDetected — no federal limit
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    range8.8–46 mg/L
  • City Of CotatiZone
    range30–35 mg/L

Disinfection byproducts

ContaminantMeasuredStatus
HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter.11.99–12.46 ug/LRangeSonoma WaterWithin the limit
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    range11.99–12.46 ug/L21% of limit
  • City Of CotatiZone
    range0–6.9 ug/L12% of limit

Radionuclides

ContaminantMeasuredStatus
Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances.0.73–1.8 pCi/LRangeCity Of CotatiWithin the limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range0.73–1.8 pCi/L12% of limit
  • Sonoma WaterZone
    range0–1.48 pCi/L10% of limit

Inorganic chemicals

ContaminantMeasuredStatus
FluorideA mineral often added to drinking water to help prevent tooth decay.0–0.25 mg/LRangeCity Of CotatiWithin the limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range0–0.25 mg/L6% of limit
  • Sonoma WaterZone
    range0–0.12 mg/L3% of limit
NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits.Not detected mg/LReported levelCity Of CotatiNone detected
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    0% of limit
  • Sonoma WaterZone
    0% of limit
ChlorideA naturally occurring salt compound.39–68 mg/LRangeCity Of CotatiDetected — no federal limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range39–68 mg/L
  • Sonoma WaterZone
    range4.6–21 mg/L
SulfateA naturally occurring mineral from rock and soil.9–34 mg/LRangeCity Of CotatiDetected — no federal limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range9–34 mg/L
  • Sonoma WaterZone
    range3.2–15 mg/L

Other

ContaminantMeasuredStatus
Chromium0–1 ug/LRangeCity Of CotatiWithin the limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range0–1 ug/L1% of limit
  • Sonoma WaterZone
    range0.29–0.47 ug/L0% of limit

PFAS ("forever chemicals")

ContaminantMeasuredStatus
Hexafluoropropylene oxide dimer acidHFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound.Not detected ug/LReported levelSonoma WaterNone detected
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    0% of limit
  • City Of CotatiZone
    0% of limit
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)N-ethyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound.Not detected ug/LReported levelSonoma WaterNone detected
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)N-methyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound.Not detected ug/LReported levelCity Of CotatiNone detected
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
  • Sonoma WaterZone
Perfluorodecanoic acid (PFDA)Perfluorodecanoic acid, a longer-chain PFAS 'forever chemical.'Not detected ug/LReported levelCity Of CotatiNone detected
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
  • Sonoma WaterZone
Perfluorododecanoic acid (PFDoA)Perfluorododecanoic acid, a longer-chain PFAS 'forever chemical.'Not detected ug/LReported levelCity Of CotatiNone detected
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
  • Sonoma WaterZone
Perfluoroheptanesulfonic acid (PFHpS)Perfluoroheptanesulfonic acid, a PFAS 'forever chemical.'Not detected ug/LReported levelSonoma WaterNone detected
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluoropentanesulfonic acid (PFPeS)Perfluoropentanesulfonic acid, a PFAS 'forever chemical.'Not detected ug/LReported levelCity Of CotatiNone detected
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
  • Sonoma WaterZone
Perfluorotetradecanoic acid (PFTeDA)Perfluorotetradecanoic acid, a longer-chain PFAS 'forever chemical.'Not detected ug/LReported levelSonoma WaterNone detected
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluorotridecanoic acid (PFTrDA)Perfluorotridecanoic acid, a longer-chain PFAS 'forever chemical.'Not detected ug/LReported levelSonoma WaterNone detected
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluoroundecanoic acid (PFUnA)Perfluoroundecanoic acid, a longer-chain PFAS 'forever chemical.'Not detected ug/LReported levelSonoma WaterNone detected
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
PFASNot detected ug/LReported levelSonoma WaterNone detected
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
PFBAPerfluorobutanoic acid, a shorter-chain PFAS 'forever chemical.'Not detected ug/LReported levelSonoma WaterNone detected
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products.Not detected ug/LReported levelCity Of CotatiNone detected
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    0% of limit
  • Sonoma WaterZone
    0% of limit

Physical & aggregate

ContaminantMeasuredStatus
AlkalinityA measure of the water's capacity to neutralize acids.120–140 mg/LRangeCity Of CotatiDetected — no federal limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range120–140 mg/L
  • Sonoma WaterZone
    range91–130 mg/L
Bicarbonate150–200 mg/LRangeCity Of CotatiDetected — no federal limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range150–200 mg/L
  • Sonoma WaterZone
    range91–130 mg/L
ColorA measure of visible tint in the water.0–12RangeSonoma WaterDetected — no federal limit
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    range0–12
  • City Of CotatiZone
HardnessA measure of dissolved calcium and magnesium minerals.98–220 mg/LRangeCity Of CotatiDetected — no federal limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range98–220 mg/L
  • Sonoma WaterZone
    range38–111 mg/L
OdorA measure of detectable smell in the water.0–7.1RangeSonoma WaterDetected — no federal limit
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    range0–7.1
  • City Of CotatiZone
pHA measure of how acidic or basic the water is.7.15–8.38RangeSonoma WaterDetected — no federal limit
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    range7.15–8.38
  • City Of CotatiZone
    range6.7–7.1
Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content.330–490RangeCity Of CotatiDetected — no federal limit
+By source (2)City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range330–490
  • Sonoma WaterZone
    range230–270
TurbidityA measure of cloudiness from suspended particles in the water.0–7.2RangeSonoma WaterDetected — no federal limit
+By source (2)Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    range0–7.2
  • City Of CotatiZone
    range0.2–0.55
Source: Cotati, City of — Cotati, Ca, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. utility is required to publish. The numbers on this page are the utility's own. A water-quality report covers an entire service area, not a single address.

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.

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