Serving roughly 545,716 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 FRESNO
1 water provider directly on file, serving roughly 545,716 people in Fresno County, California.
Quick answer: CITY OF FRESNO has no violations on file. One reading is worth knowing about: Nitrate was measured at 8.9MG/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
PFBS
PFHPA
PFNA
PFOA
PFHXS
PFPEA
Pfpes
PFHXA
PFOS
PFBA
Nitrate
Perfluorobutanesulfonicacid (PFBS)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
Perfluoroheptanoicacid (PFHPA)
Perfluorohexanesulfonicacid (PFHxS)
TTHM
1, 2-Dibromo-3-Chloropropane
Chromium, Hex
Trichloroethylene
Tetrachloroethylene
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Aggressive Index
Langelier Index (pH(s))
Magnesium
Calcium
Sodium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
Nitrate-Nitrite
Turbidity
Gross Alpha Particle Activity
pH
Iron
Arsenic
Conductivity (at 25°C)
Utility CITY OF FRESNOPopulation served 545,716Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Chromium, Hex
Detected: 0.5 UG/L (ppb)
5/8/2025
Iron
Detected: 530 UG/L (ppb)
1/9/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Arsenic
Detected: 2.2 UG/L (ppb)
1/9/2025
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
TTHM
Detected: 0.55 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: 0.55 UG/L (ppb)
7/9/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 0.67 UG/L (ppb)
5/8/2025
Bromodichloromethane
Detected: 0.56 UG/L (ppb)
4/9/2025
Dibromochloromethane
Detected: 0.64 UG/L (ppb)
5/8/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 8.9 MG/L (ppm)
10/27/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Chloride
Detected: 8.6 MG/L (ppm)
1/9/2025
Sulfate
Detected: 7.9 MG/L (ppm)
1/9/2025
Nitrate-Nitrite
Detected: 3.3 MG/L (ppm)
1/9/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 11 MG/L (ppm)
1/9/2025
Calcium
Detected: 21 MG/L (ppm)
1/9/2025
Sodium
Detected: 30 MG/L (ppm)
1/9/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: -0.29 LANG
1/9/2025
Hardness, Total (ASCACO3)
Detected: 98 MG/L (ppm)
1/9/2025
Gross Alpha Particle Activity
Detected: 4.33 PCI/L
1/9/2025
pH
Detected: 7.9 PH
1/9/2025
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
PFBS
Detected: 0.0035 µg/L (ppb)
8/14/2024
PFHPA
Detected: 0.0038 µg/L (ppb)
8/15/2024
PFNA
Detected: 0.0052 µg/L (ppb)
3/20/2023
PFOA
Detected: 0.0061 µg/L (ppb)
8/15/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXS
Detected: 0.0072 µg/L (ppb)
2/28/2024
PFPEA
Detected: 0.01 µg/L (ppb)
8/15/2024
Pfpes
Detected: 0.0047 µg/L (ppb)
9/8/2023
PFHXA
Detected: 0.0077 µg/L (ppb)
8/15/2024
PFOS
Detected: 0.0053 µg/L (ppb)
8/14/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFBA
Detected: 0.0078 µg/L (ppb)
2/28/2024
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Trichloroethylene
Detected: 1.5 UG/L (ppb)
10/9/2025
Tetrachloroethylene
Detected: 0.7 UG/L (ppb)
10/9/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 140 MG/L (ppm)
1/9/2025
Other
Additional substances tested that don't fit neatly into the categories above
Perfluorobutanesulfonicacid (PFBS)
Detected: 3.3 NG/L (ppt)
8/20/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 10 NG/L (ppt)
8/20/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 13 NG/L (ppt)
8/20/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 8.9 NG/L (ppt)
8/20/2025
Perfluorobutanoicacid (PFBA)
Detected: 3.1 NG/L (ppt)
8/20/2025
Perfluoropentanoicacid (PFPEA)
Detected: 2.2 NG/L (ppt)
9/12/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 4.9 NG/L (ppt)
8/20/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 4.6 NG/L (ppt)
8/20/2025
1, 2-Dibromo-3-Chloropropane
Detected: 0.16 UG/L (ppb)
10/3/2025
Aggressive Index
Detected: 11.8 AGGR
1/9/2025
Alkalinity, Total
Detected: 140 MG/L (ppm)
1/9/2025
TDS
Detected: 220 MG/L (ppm)
1/9/2025
Turbidity
Detected: 1.6 NTU
1/9/2025
A measure of water cloudiness from suspended particles.
Conductivity (at 25°C)
Detected: 310 UMHO/CM
1/9/2025
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.