The Water Map

Drinking water quality · 2023

What's in Cotati, City of — Cotati, Ca, CA tap water

57 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.

Browse the mapFull source report ↗
Reporting year
2023
Contaminants measured
57
Over federal limit
0
Approaching the limit
0
Service area
CA
state-level CCR
Source
Utility CCR
View document ↗
All within federal limits. Every measured contaminant in this report is below its federal threshold.

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.

No federal drinking-water violations on record for this system.

Metals

ContaminantMeasuredStatus
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.0.1–0.2 mg/LRangeCity Of CotatiWithin the limit
+By source (2)— City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range0.1–0.2 mg/L10% of limit
  • Sonoma WaterZone
    range0–0.1 mg/L6% of limit
CopperA metal that enters water from corroding household plumbing.23 ug/LRangeSonoma WaterWithin the limit
LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures.0.0 mg/L90th percentileAt the tapNone detected
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
TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter.3.7–14 ug/LRangeCity Of CotatiWithin the limit
+By source (2)— City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range3.7–14 ug/L18% of limit
  • Sonoma WaterZone
    0% 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 levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    0% of limit
  • City Of CotatiZone
    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
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid, a chlorinated PFAS compound.Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)ADONA, a newer-generation PFAS replacement compound.Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
4:2 Fluorotelomer sulfonic acid (4:2 FTS)4:2 fluorotelomer sulfonic acid, a PFAS-related compound.Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
6:2 Fluorotelomer sulfonic acid (6:2 FTS)6:2 fluorotelomer sulfonic acid, a PFAS-related compound.Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
8:2 Fluorotelomer sulfonic acid (8:2 FTS)8:2 fluorotelomer sulfonic acid, a PFAS-related compound.Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS)9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid, a chlorinated PFAS compound.Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Hexafluoropropylene oxide dimer acidHFPO-DA ('GenX chemicals'), a newer-generation PFAS replacement compound.Not detected ng/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 ng/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 ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Nonafluoro-3,6-dioxaheptanoic acidNonafluoro-3,6-dioxaheptanoic acid, a PFAS-related compound.Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluoro-3-methoxypropanoic acid (PFMPA)Perfluoro-3-methoxypropanoic acid, a PFAS-related compound.Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluoro-4-methoxybutanoic acid (PFMBA)Perfluoro-4-methoxybutanoic acid, a PFAS-related compound.Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA)Perfluoro(2-ethoxyethane)sulfonic acid, a PFAS-related compound.Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.'Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluorodecanoic acid (PFDA)Perfluorodecanoic acid, a longer-chain PFAS 'forever chemical.'Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluorododecanoic acid (PFDoA)Perfluorododecanoic acid, a longer-chain PFAS 'forever chemical.'Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluoroheptanesulfonic acid (PFHpS)Perfluoroheptanesulfonic acid, a PFAS 'forever chemical.'Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.'Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.'Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    0% of limit
  • City Of CotatiZone
    0% of limit
Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.'Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.'Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    0% of limit
  • City Of CotatiZone
    0% of limit
Perfluoropentanesulfonic acid (PFPeS)Perfluoropentanesulfonic acid, a PFAS 'forever chemical.'Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.'Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone
Perfluorotetradecanoic acid (PFTeDA)Perfluorotetradecanoic acid, a longer-chain PFAS 'forever chemical.'Not detected ng/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 ng/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 ng/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 ng/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 ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    0% of limit
  • City Of CotatiZone
    0% of limit
PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings.Not detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
    0% of limit
  • City Of CotatiZone
    0% of limit

VOCs & pesticides

ContaminantMeasuredStatus
1,2,3-TCPNot detected ng/LReported levelSonoma WaterNone detected
+By source (2)— Sonoma Water, City Of Cotati
  • Sonoma WaterZone
  • City Of CotatiZone

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
Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts.310–350 mg/LRangeCity Of CotatiDetected — no federal limit
+By source (2)— City Of Cotati, Sonoma Water
  • City Of CotatiZone
    range310–350 mg/L
  • Sonoma WaterZone
    range110–180 mg/L
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?

Every one of the 57 contaminants measured in Cotati, City of — Cotati, 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 Cotati, City of — Cotati, Ca, CA tap water?

57 contaminants were measured in Cotati, City of — Cotati, Ca, CA's 2023 Consumer Confidence Report, spanning pfas ("forever chemicals"), metals, and physical & aggregate. 41 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.

+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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