Serving roughly 67,457 people in Yolo County, California.
Data current as of July 2026
🔍Straight from EPA
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Results for CITY OF DAVIS
1 water provider directly on file, serving roughly 67,457 people in Yolo County, California.
Quick answer: CITY OF DAVIS 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.
Lead Summary
Lithium
Lead
Copper, Free
Arsenic
Aggressive Index
Langelier Index (pH(s))
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Chloride
Sulfate
Fluoride
Nitrate
Nitrate-Nitrite
Turbidity
pH
Odor
Iron
Manganese
Chromium, Hex
Carbontetrachloride
Chromium
Selenium
Conductivity (at 25°C)
Utility CITY OF DAVISPopulation served 67,457Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2026
Lead
Detected: 6.8 UG/L (ppb)
7/22/2025
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: 13 UG/L (ppb)
8/14/2025
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: 2.3 UG/L (ppb)
8/14/2025
Chromium
Detected: 11 UG/L (ppb)
8/14/2025
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
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)
8/14/2025
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: See the table below for how whole-house carbon, under-sink reverse osmosis, and under-sink carbon systems compare against what's actually on file here. These are general system types, not a specific product recommendation.