FAIRFIELD is served by 3 water providers on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for FAIRFIELD, CA
3 water providers on file serving this city.
Quick answer: FAIRFIELD's water currently has an open health-based violation on file: Lead And Copper Rule Revisions, a compliance issue since 10/17/2024. This is active, not historical — see the violation detail below for what EPA's enforcement record shows.
Lead Summary
Copper Summary
Copper, Free
Fluoride
Chromium, Hex
Barium
Arsenic
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Trichloroaceticacid
Dichloroaceticacid
Dibromoaceticacid
Monochloroaceticacid
Aggressive Index
Temperature (CENTIGRADE)
Langelier Index (pH(s))
Langelier Index (Source Temp.)
Magnesium
Potassium
Sodium
Calcium
Nitrogen-Ammoniaas (N)
Alkalinity, Total
Alkalinity, Bicarbonate
Alkalinity, Carbonate
Hardness, Total (ASCACO3)
Carbon, Total
TDS
Chloride
Sulfate
Nitrate
Violations on file
Lead And Copper Rule Revisions
Currently open health violation
Found at 1 of 3 providers
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
Found at 3 providers
Copper Summary
Detected: 1.63 mg/L (ppm)
06/30/2018
Copper, Free
Detected: 226 UG/L (ppb)
7/15/2025
Chromium, Hex
Detected: 0.059 UG/L (ppb)
2/18/2025
Barium
Detected: 469 UG/L (ppb)
7/15/2025
Arsenic
Detected: 4.9 UG/L (ppb)
7/15/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 13 UG/L (ppb)
7/9/2025
TTHM
Detected: 25 UG/L (ppb)
7/9/2025
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.
Chloroform
Detected: 18 UG/L (ppb)
7/9/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 0.52 UG/L (ppb)
1/15/2025
Bromodichloromethane
Detected: 5.5 UG/L (ppb)
7/9/2025
Dibromochloromethane
Detected: 1.8 UG/L (ppb)
7/9/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Fluoride
Detected: 0.735 MG/L (ppm)
Found at 2 providers
Often added deliberately for dental health; can also occur naturally.
Chloride
Detected: 9.7 MG/L (ppm)
10/8/2025
Sulfate
Detected: 38 MG/L (ppm)
10/8/2025
Nitrate
Detected: 0.1 MG/L (ppm)
10/8/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 20 MG/L (ppm)
10/8/2025
Potassium
Detected: 1.5 MG/L (ppm)
10/8/2025
Sodium
Detected: 23 MG/L (ppm)
10/8/2025
Calcium
Detected: 16 MG/L (ppm)
10/8/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 0.84 LANG
10/8/2025
Hardness, Total (ASCACO3)
Detected: 135 MG/L (ppm)
10/8/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 120 MG/L (ppm)
10/8/2025
Alkalinity, Carbonate
Detected: 6.2 MG/L (ppm)
4/1/2025
Other
Additional substances tested that don't fit neatly into the categories above
Trichloroaceticacid
Detected: 5.6 UG/L (ppb)
7/9/2025
Dichloroaceticacid
Detected: 4.9 UG/L (ppb)
7/9/2025
Dibromoaceticacid
Detected: 1 UG/L (ppb)
4/2/2025
Monochloroaceticacid
Detected: 2.6 UG/L (ppb)
7/9/2025
Aggressive Index
Detected: 12 AGGR
10/8/2025
Temperature (CENTIGRADE)
Detected: 19 C
10/8/2025
Langelier Index (Source Temp.)
Detected: 0.24 LANG
10/8/2025
Nitrogen-Ammoniaas (N)
Detected: 0.062 MG/L (ppm)
1/7/2025
Alkalinity, Total
Detected: 120 MG/L (ppm)
10/8/2025
Carbon, Total
Detected: 1.9 MG/L (ppm)
10/8/2025
TDS
Detected: 200 MG/L (ppm)
10/8/2025
Filtration considerations: General system types, not a specific product recommendation.