Serving roughly 7,115 people in Yolo County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for CITY OF WINTERS
1 water provider directly on file, serving roughly 7,115 people in Yolo County, California.
Quick answer: CITY OF WINTERS has no violations on file and no single reading stands out against its peers (218 other providers in this area). It serves roughly 7,115 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Lithium
PFNA
Aggressive Index
Langelier Index (pH(s))
Magnesium
Calcium
Sodium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
Fluoride
Nitrate
Nitrate-Nitrite
Turbidity
pH
Odor
1, 2, 3-Trichloropropane
Chromium, Hex
Chromium
Barium
Conductivity (at 25°C)
Utility CITY OF WINTERSPopulation served 7,115Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2023
Chromium, Hex
Detected: 4.2 UG/L (ppb)
10/2/2025
Chromium
Detected: 18 UG/L (ppb)
5/22/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Barium
Detected: 78 UG/L (ppb)
5/22/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 9.5 MG/L (ppm)
5/22/2025
Sulfate
Detected: 31 MG/L (ppm)
5/22/2025
Fluoride
Detected: 0.13 MG/L (ppm)
5/22/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 1.1 MG/L (ppm)
5/22/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Nitrate-Nitrite
Detected: 1.1 MG/L (ppm)
5/22/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 36 MG/L (ppm)
5/22/2025
Calcium
Detected: 30 MG/L (ppm)
5/22/2025
Sodium
Detected: 15 MG/L (ppm)
5/22/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 0.15 LANG
5/22/2025
Hardness, Total (ASCACO3)
Detected: 220 MG/L (ppm)
5/22/2025
pH
Detected: 8 PH
5/22/2025
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: 9.7 µg/L (ppb)
12/11/2023
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFNA
Detected: 0.0042 µg/L (ppb)
8/14/2023
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
1, 2, 3-Trichloropropane
Detected: 0.015 UG/L (ppb)
5/22/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 200 MG/L (ppm)
5/22/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 12.2 AGGR
5/22/2025
Alkalinity, Total
Detected: 200 MG/L (ppm)
5/22/2025
TDS
Detected: 280 MG/L (ppm)
5/22/2025
Turbidity
Detected: 0.34 NTU
5/22/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 2.8 TON
5/22/2025
Conductivity (at 25°C)
Detected: 470 UMHO/CM
5/22/2025
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.