ANTIOCH is served by 1 water provider on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for ANTIOCH, CA
1 water provider on file serving this city.
Quick answer: ANTIOCH's water has no violations on file and no single reading stands out against its peers (1 other providers in this area). It serves roughly 115,074 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Copper Summary
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dibromochloromethane
Bromoform
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Magnesium
Potassium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
Orthophosphate
TDS
Sulfate
Chloride
Fluoride
Nitrate
Turbidity
pH
Odor
Iron
Manganese
Chromium, Hex
Nickel
Chromium
Barium
Arsenic
Copper, Free
Aluminum
Zinc
Conductivity (at 25°C)
Color
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2024
Copper Summary
Detected: 104 mg/L (ppm)
12/31/1992
Iron
Detected: 510 UG/L (ppb)
6/12/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 22 UG/L (ppb)
6/12/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Chromium, Hex
Detected: 0.11 UG/L (ppb)
6/12/2025
Nickel
Detected: 2 UG/L (ppb)
6/12/2025
Chromium
Detected: 1.2 UG/L (ppb)
6/12/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Barium
Detected: 23 UG/L (ppb)
6/12/2025
Arsenic
Detected: 2.1 UG/L (ppb)
6/12/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Copper, Free
Detected: 2.1 UG/L (ppb)
6/12/2025
Aluminum
Detected: 400 UG/L (ppb)
6/12/2025
Zinc
Detected: 19 UG/L (ppb)
6/12/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 2.6 UG/L (ppb)
9/3/2025
TTHM
Detected: 57 UG/L (ppb)
9/3/2025
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: 6.1 UG/L (ppb)
9/3/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 14 UG/L (ppb)
9/3/2025
Dibromochloromethane
Detected: 19 UG/L (ppb)
9/3/2025
Bromoform
Detected: 18 UG/L (ppb)
9/3/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Sulfate
Detected: 20 MG/L (ppm)
6/12/2025
Chloride
Detected: 92 MG/L (ppm)
6/12/2025
Fluoride
Detected: 0.065 MG/L (ppm)
6/12/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 0.067 MG/L (ppm)
6/12/2025
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: 11 MG/L (ppm)
6/12/2025
Potassium
Detected: 2.8 MG/L (ppm)
6/12/2025
Sodium
Detected: 54 MG/L (ppm)
6/12/2025
Calcium
Detected: 13 MG/L (ppm)
6/12/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 78 MG/L (ppm)
6/12/2025
Orthophosphate
Detected: 0.079 MG/L (ppm)
6/12/2025
pH
Detected: 7.9 PH
6/12/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 56 MG/L (ppm)
6/12/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 1.1 UG/L (ppb)
9/3/2025
Trichloroaceticacid
Detected: 4.5 UG/L (ppb)
3/5/2025
Dibromoaceticacid
Detected: 1.3 UG/L (ppb)
9/3/2025
Alkalinity, Total
Detected: 56 MG/L (ppm)
6/12/2025
TDS
Detected: 260 MG/L (ppm)
6/12/2025
Turbidity
Detected: 9.4 NTU
6/12/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 1 TON
6/12/2025
Conductivity (at 25°C)
Detected: 460 UMHO/CM
6/12/2025
Color
Detected: 15 UNITS
6/12/2025
Filtration considerations: General system types, not a specific product recommendation.