Serving roughly 130,130 people in Fresno County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for CITY OF CLOVIS
1 water provider directly on file, serving roughly 130,130 people in Fresno County, California.
Quick answer: CITY OF CLOVIS has no violations on file. One reading is worth knowing about: PFOA was measured at 0.018µg/L, among the highest of the 704 providers on file in this area. It's the most notable figure in this system's record among its 704 local peers.
Lead Summary
PFOA
PFHXA
Pfda
PFBS
PFOS
PFHXS
PFPEA
PFHPA
PFNA
PFBA
Aggressive Index
Langelier Index (pH(s))
Magnesium
Potassium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
Foamingagents (SURFACTANTS)
Alkalinity, Carbonate
Fluoride
Nitrate-Nitrite
Nitrate
Perfluorobutanesulfonicacid (PFBS)
Perfluoroheptanoicacid (PFHPA)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorodecanoicacid (PFDA)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
Utility CITY OF CLOVISPopulation served 130,130Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2024
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 6.2 MG/L (ppm)
7/28/2025
Sulfate
Detected: 4.4 MG/L (ppm)
7/28/2025
Fluoride
Detected: 0.16 MG/L (ppm)
7/28/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 0.7 MG/L (ppm)
7/28/2025
Nitrate
Detected: 5.7 MG/L (ppm)
10/22/2025
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)
7/28/2025
Potassium
Detected: 2 MG/L (ppm)
7/28/2025
Sodium
Detected: 17 MG/L (ppm)
7/28/2025
Calcium
Detected: 21 MG/L (ppm)
7/28/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: -0.53 LANG
7/28/2025
Hardness, Total (ASCACO3)
Detected: 95 MG/L (ppm)
7/28/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFOA
Detected: 0.018 µg/L (ppb)
11/21/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXA
Detected: 0.008 µg/L (ppb)
11/21/2023
Pfda
Detected: 0.003 µg/L (ppb)
11/3/2023
PFBS
Detected: 0.0061 µg/L (ppb)
11/21/2023
PFOS
Detected: 0.041 µg/L (ppb)
11/21/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXS
Detected: 0.0032 µg/L (ppb)
11/21/2023
PFPEA
Detected: 0.0084 µg/L (ppb)
11/21/2023
PFHPA
Detected: 0.0057 µg/L (ppb)
11/21/2023
PFNA
Detected: 0.0069 µg/L (ppb)
11/21/2023
PFBA
Detected: 0.0061 µg/L (ppb)
11/21/2023
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 120 MG/L (ppm)
7/28/2025
Alkalinity, Carbonate
Detected: 4.9 MG/L (ppm)
7/16/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 11.5 AGGR
7/28/2025
Alkalinity, Total
Detected: 120 MG/L (ppm)
7/28/2025
TDS
Detected: 210 MG/L (ppm)
7/28/2025
Foamingagents (SURFACTANTS)
Detected: 0.05 MG/L (ppm)
7/24/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 10 NG/L (ppt)
10/20/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 2.5 NG/L (ppt)
10/16/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 7.2 NG/L (ppt)
10/20/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 4.2 NG/L (ppt)
10/20/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorodecanoicacid (PFDA)
Detected: 3.2 NG/L (ppt)
10/16/2025
Perfluorohexanoicacid (PFHXA)
Detected: 2.7 NG/L (ppt)
10/20/2025
Perfluorobutanoicacid (PFBA)
Detected: 3.1 NG/L (ppt)
10/20/2025
Perfluoropentanoicacid (PFPEA)
Detected: 2.7 NG/L (ppt)
10/20/2025
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.