Serving roughly 26,517 people in Fresno County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for CWS - SELMA
1 water provider directly on file, serving roughly 26,517 people in Fresno County, California.
Quick answer: CWS - SELMA has no violations on file and no single reading stands out against its peers (704 other providers in this area). It serves roughly 26,517 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Lead
Copper, Free
Silica
Combined Uranium
Strontium
Barium
Aggressive Index
Langelier Index (pH(s))
Magnesium
Calcium
Sodium
Potassium
Alkalinity, Total
Alkalinity, Bicarbonate
Alkalinity, Carbonate
Hardness, Total (ASCACO3)
Foamingagents (SURFACTANTS)
TDS
Chloride
Sulfate
Fluoride
Nitrate-Nitrite
Nitrate
Turbidity
pH, Field
1, 2, 3-Trichloropropane
Iron
Manganese
1, 2-Dibromo-3-Chloropropane
Chromium, Hex
Arsenic
Aluminum
Conductivity (at 25°C)
Color
Utility CWS - SELMAPopulation served 26,517Owner Private
No violations on file
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: 5.2 UG/L (ppb)
7/30/2025
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: 20.4 UG/L (ppb)
8/21/2025
Combined Uranium
Detected: 5.8 PCI/L
6/4/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Strontium
Detected: 340 UG/L (ppb)
8/14/2025
Barium
Detected: 27 UG/L (ppb)
6/4/2025
Iron
Detected: 590 UG/L (ppb)
3/20/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 60 UG/L (ppb)
3/20/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Chromium, Hex
Detected: 1.1 UG/L (ppb)
8/14/2025
Arsenic
Detected: 4.2 UG/L (ppb)
7/23/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Aluminum
Detected: 160 UG/L (ppb)
3/20/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 5.8 MG/L (ppm)
8/14/2025
Sulfate
Detected: 23 MG/L (ppm)
8/14/2025
Fluoride
Detected: 0.1 MG/L (ppm)
6/3/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 3.4 MG/L (ppm)
8/14/2025
Nitrate
Detected: 4.5 MG/L (ppm)
9/17/2025
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: 0.48 MG/L (ppm)
4/8/2025
Calcium
Detected: 12 MG/L (ppm)
7/23/2025
Sodium
Detected: 23 MG/L (ppm)
7/23/2025
Potassium
Detected: 2.1 MG/L (ppm)
3/20/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: -0.89 LANG
8/14/2025
Hardness, Total (ASCACO3)
Detected: 29 MG/L (ppm)
7/23/2025
pH, Field
Detected: 7.24 PH
10/28/2025
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
1, 2, 3-Trichloropropane
Detected: 0.019 UG/L (ppb)
9/23/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 110 MG/L (ppm)
8/14/2025
Alkalinity, Carbonate
Detected: 5.7 MG/L (ppm)
7/23/2025
Other
Additional substances tested that don't fit neatly into the categories above
Silica
Detected: 21 MG/L (ppm)
6/4/2025
Aggressive Index
Detected: 11.1 AGGR
8/14/2025
Alkalinity, Total
Detected: 110 MG/L (ppm)
8/14/2025
Foamingagents (SURFACTANTS)
Detected: 0.053 MG/L (ppm)
1/16/2025
TDS
Detected: 200 MG/L (ppm)
8/14/2025
Turbidity
Detected: 2.2 NTU
3/20/2025
A measure of water cloudiness from suspended particles.
1, 2-Dibromo-3-Chloropropane
Detected: 0.021 UG/L (ppb)
9/23/2025
Conductivity (at 25°C)
Detected: 290 UMHO/CM
8/14/2025
Color
Detected: 5 UNITS
3/20/2025
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.