FRESNO is served by 16 water providers on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for FRESNO, CA
16 water providers on file serving this city.
Quick answer: FRESNO's water has no violations on file and no single reading stands out against its peers (16 other providers in this area). It serves roughly 545,716 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Nitrate
Perfluorohexanesulfonicacid (PFHxS)
Perfluorononanoicacid (PFNA)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorobutanoicacid (PFBA)
Perfluorobutanesulfonicacid (PFBS)
Perfluorohexanoicacid (PFHXA)
Combined Uranium
Gross Alpha Particle Activity
PFBS
PFHPA
PFNA
PFOA
PFHXS
PFPEA
Pfpes
PFHXA
PFOS
PFBA
Perfluoropentanoicacid (PFPEA)
Perfluoroheptanoicacid (PFHPA)
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
pH
Iron
Arsenic
Conductivity (at 25°C)
Potassium
Manganese
Zinc
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0134 mg/L (ppm)
Found at 2 providers
Combined Uranium
Detected: 5.8 PCI/L
7/22/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
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.
Manganese
Detected: 180 UG/L (ppb)
9/3/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Zinc
Detected: 360 UG/L (ppb)
9/3/2025
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)
Found at 6 providers
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: 25 MG/L (ppm)
Found at 2 providers
Calcium
Detected: 50 MG/L (ppm)
Found at 2 providers
Sodium
Detected: 30 MG/L (ppm)
Found at 2 providers
Potassium
Detected: 9.8 MG/L (ppm)
9/3/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Gross Alpha Particle Activity
Detected: 14.2 PCI/L
Found at 2 providers
Langelier Index (pH(s))
Detected: -0.29 LANG
1/9/2025
Hardness, Total (ASCACO3)
Detected: 230 MG/L (ppm)
Found at 2 providers
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
Perfluorohexanesulfonicacid (PFHxS)
Detected: 11 NG/L (ppt)
Found at 2 providers
Perfluorononanoicacid (PFNA)
Detected: 6.8 NG/L (ppt)
10/21/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 48 NG/L (ppt)
Found at 2 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 15 NG/L (ppt)
Found at 2 providers
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorobutanoicacid (PFBA)
Detected: 7.2 NG/L (ppt)
Found at 2 providers
Perfluorobutanesulfonicacid (PFBS)
Detected: 3.3 NG/L (ppt)
Found at 2 providers
Perfluorohexanoicacid (PFHXA)
Detected: 8.9 NG/L (ppt)
Found at 2 providers
Perfluoropentanoicacid (PFPEA)
Detected: 2.2 NG/L (ppt)
9/12/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 4.9 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: General system types, not a specific product recommendation.