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Water Quality Lookup / California / Yolo County / DAVIS
EPA SDWIS · Yolo County, California

Is DAVIS, CA Tap Water Safe?

DAVIS is served by 2 water providers on file with the EPA.

Data current as of July 2026
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Results for DAVIS, CA

2 water providers on file serving this city.

Quick answer: DAVIS's water has no violation currently counted toward its compliance status. EPA's record shows a Selenium violation dating to 08/01/1987 (39 years ago) — because it's more than five years past its deadline, EPA's policy no longer treats it as part of this system's current standing, though it remains on the public record.

Violations on file

Selenium
Older/archived health-based violation
Found at 1 of 2 providers

Contaminants found

Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0004 mg/L (ppm)
Found at 2 providers
Lead
Detected: 6.8 UG/L (ppb)
Found at 2 providers
A metal that can leach from old pipes, solder, and fixtures. Current medical guidance holds there is no truly safe level of lead exposure, especially for children and pregnant women.
Copper, Free
Detected: 294 UG/L (ppb)
Found at 2 providers
Arsenic
Detected: 7.1 UG/L (ppb)
9/23/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Iron
Detected: 43 UG/L (ppb)
2/13/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 13 UG/L (ppb)
9/23/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Chromium, Hex
Detected: 33 UG/L (ppb)
Found at 2 providers
Chromium
Detected: 36 UG/L (ppb)
Found at 2 providers
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Selenium
Detected: 16 UG/L (ppb)
8/14/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 3.6 UG/L (ppb)
6/9/2025
A group of disinfection byproducts formed when chlorine reacts with organic matter. Long-term exposure above the legal limit has been linked to increased cancer risk in some studies.
Bromoform
Detected: 0.5 UG/L (ppb)
6/9/2025
Bromodichloromethane
Detected: 1.6 UG/L (ppb)
6/9/2025
Dibromochloromethane
Detected: 1.4 UG/L (ppb)
6/9/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 60 MG/L (ppm)
8/14/2025
Sulfate
Detected: 100 MG/L (ppm)
8/14/2025
Fluoride
Detected: 0.34 MG/L (ppm)
8/14/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 4.8 MG/L (ppm)
Found at 2 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Nitrate-Nitrite
Detected: 4.8 MG/L (ppm)
8/14/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 0.57 LANG
8/14/2025
pH
Detected: 7.9 PH
8/14/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 34.9 µg/L (ppb)
8/22/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Carbontetrachloride
Detected: 0.51 UG/L (ppb)
9/23/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 470 MG/L (ppm)
8/14/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 12.7 AGGR
8/14/2025
Alkalinity, Total
Detected: 470 MG/L (ppm)
8/14/2025
TDS
Detected: 770 MG/L (ppm)
8/14/2025
Turbidity
Detected: 0.56 NTU
8/14/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 4 TON
8/14/2025
Conductivity (at 25°C)
Detected: 1300 UMHO/CM
8/14/2025
Filtration considerations: General system types, not a specific product recommendation.
Contaminant Whole-House Carbon Under-Sink RO Under-Sink Carbon
Total Trihalomethanes (TTHM)YesYesYes
Haloacetic Acids (HAA5)YesYesYes
ChloroformYesYesYes
Chlorine / TasteYesYesYes
Sediment / TurbidityYesYesYes
TrichloroethyleneYesYesYes
TetrachloroethyleneYesYesYes
cis-1,2-DichloroethyleneYesYesYes
1,1-DichloroethyleneYesYesYes
BromoformYesYesYes
BromodichloromethaneYesYesYes
DibromochloromethaneYesYesYes
1,1,2-TrichloroethaneYesYesYes
Vinyl ChlorideYesYesYes
Carbon TetrachlorideYesYesYes
BenzeneYesYesYes
TolueneYesYesYes
XyleneYesYesYes
CarbontetrachlorideYesYesYes
LeadPartialYesPartial
ArsenicPartialYesPartial
Chromium-6 (Hexavalent)PartialYesPartial
CopperPartialYesPartial
Combined UraniumPartialYesPartial
PFOAPartialYes*Partial
PFOSPartialYes*Partial
NitratePartialYesPartial
Combined RadiumPartialYesPartial
LithiumPartialYes*Partial
Copper, FreePartialYesPartial
Aggressive IndexPartialYesPartial
Alkalinity, TotalPartialYesPartial
TDSPartialYesPartial
ChloridePartialYesPartial
SulfatePartialYesPartial
FluoridePartialYesPartial
Nitrate-NitritePartialYesPartial
OdorPartialYesPartial
IronPartialYesPartial
ManganesePartialYesPartial
Chromium, HexPartialYesPartial
ChromiumPartialYesPartial
SeleniumPartialYesPartial
Conductivity (at 25°C)PartialYesPartial
Coliform Bacteria (indicator)NoYesNo
Langelier Index (pH(s))NoNoNo
Alkalinity, BicarbonateNoNoNo
pHNoNoNo

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Learn more
What is TTHM? Understanding EPA Violation Status Is Chromium-6 Dangerous? Whole-House vs. Under-Sink Filtration Lead and Copper in Drinking Water What is PFAS? Arsenic and Uranium Explained Nitrate and Fluoride Explained Water Hardness, pH, and Turbidity What is Coliform Bacteria?
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