ATWATER 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 ATWATER, CA
1 water provider on file serving this city.
Quick answer: ATWATER'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 29,479 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
PFHXA
PFPEA
PFBA
PFBS
6:2 Fts
PFOS
PFHPA
PFOA
Pfpes
PFHXS
TTHM
Lead
Bromoform
Dibromochloromethane
Copper, Free
Nitrate
Perfluorohexanesulfonicacid (PFHxS)
Perfluorohexanoicacid (PFHXA)
Perfluoropentanoicacid (PFPEA)
1, 2, 3-Trichloropropane
Perfluorobutanoicacid (PFBA)
Aggressive Index
Langelier Index (pH(s))
Magnesium
Calcium
Sodium
Potassium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
Foamingagents (SURFACTANTS)
Fluoride
Nitrate-Nitrite
Perfluorobutanesulfonicacid (PFBS)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Adsorbableorganicfluorine
Perfluoroheptanoicacid (PFHPA)
Perfluorooctanesulfonicacid6:2fts
Perfluoropentanesulfonicacid (PFPES)
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Lead
Detected: 13 UG/L (ppb)
9/16/2025
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: 54 UG/L (ppb)
9/16/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 1.1 UG/L (ppb)
7/24/2025
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: 0.51 UG/L (ppb)
7/24/2025
Dibromochloromethane
Detected: 0.61 UG/L (ppb)
7/24/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 3 MG/L (ppm)
10/21/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Chloride
Detected: 14 MG/L (ppm)
6/17/2025
Sulfate
Detected: 18 MG/L (ppm)
6/17/2025
Fluoride
Detected: 0.1 MG/L (ppm)
6/17/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 10 MG/L (ppm)
6/17/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 6.7 MG/L (ppm)
6/17/2025
Calcium
Detected: 32 MG/L (ppm)
6/17/2025
Sodium
Detected: 31 MG/L (ppm)
6/17/2025
Potassium
Detected: 9.3 MG/L (ppm)
6/17/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: -0.21 LANG
6/17/2025
Hardness, Total (ASCACO3)
Detected: 110 MG/L (ppm)
6/17/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFHXA
Detected: 0.0037 µg/L (ppb)
5/7/2024
PFPEA
Detected: 0.0048 µg/L (ppb)
5/7/2024
PFBA
Detected: 0.008 µg/L (ppb)
5/7/2024
PFBS
Detected: 0.0078 µg/L (ppb)
5/7/2024
6:2 Fts
Detected: 0.013 µg/L (ppb)
5/7/2024
PFOS
Detected: 0.045 µg/L (ppb)
5/7/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHPA
Detected: 0.012 µg/L (ppb)
5/7/2024
PFOA
Detected: 0.033 µg/L (ppb)
5/7/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Pfpes
Detected: 0.0082 µg/L (ppb)
5/7/2024
PFHXS
Detected: 0.059 µg/L (ppb)
5/7/2024
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
1, 2, 3-Trichloropropane
Detected: 0.088 UG/L (ppb)
9/16/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 110 MG/L (ppm)
6/17/2025
Other
Additional substances tested that don't fit neatly into the categories above
Perfluorohexanesulfonicacid (PFHxS)
Detected: 25 NG/L (ppt)
10/23/2025
Perfluorohexanoicacid (PFHXA)
Detected: 12 NG/L (ppt)
10/23/2025
Perfluoropentanoicacid (PFPEA)
Detected: 10 NG/L (ppt)
10/23/2025
Perfluorobutanoicacid (PFBA)
Detected: 3.5 NG/L (ppt)
10/23/2025
Aggressive Index
Detected: 11.8 AGGR
6/17/2025
Alkalinity, Total
Detected: 110 MG/L (ppm)
6/17/2025
TDS
Detected: 280 MG/L (ppm)
6/17/2025
Foamingagents (SURFACTANTS)
Detected: 0.07 MG/L (ppm)
6/17/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 4.7 NG/L (ppt)
10/23/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 14 NG/L (ppt)
10/23/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 12 NG/L (ppt)
10/23/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Adsorbableorganicfluorine
Detected: 980 NG/L (ppt)
1/21/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 4.3 NG/L (ppt)
10/23/2025
Perfluorooctanesulfonicacid6:2fts
Detected: 3.7 NG/L (ppt)
10/23/2025
Perfluoropentanesulfonicacid (PFPES)
Detected: 3.8 NG/L (ppt)
10/23/2025
Filtration considerations: General system types, not a specific product recommendation.