OROSI PUBLIC UTILITY DISTRICT Water Quality Report
Serving roughly 8,300 people in Tulare County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for OROSI PUBLIC UTILITY DISTRICT
1 water provider directly on file, serving roughly 8,300 people in Tulare County, California.
Quick answer: OROSI PUBLIC UTILITY DISTRICT has no violations on file and no single reading stands out against its peers (713 other providers in this area). It serves roughly 8,300 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Aggressive Index
Langelier Index (pH(s))
Magnesium
Potassium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
Fluoride
Nitrate
Nitrate-Nitrite
Gross Alpha Particle Activity
pH
1, 2, 3-Trichloropropane
Barium
Arsenic
Conductivity (at 25°C)
Utility OROSI PUBLIC UTILITY DISTRICTPopulation served 8,300Owner Local government
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)
12/31/2023
Barium
Detected: 110 UG/L (ppb)
7/11/2025
Arsenic
Detected: 2.2 UG/L (ppb)
7/11/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 21 MG/L (ppm)
7/11/2025
Sulfate
Detected: 17 MG/L (ppm)
7/11/2025
Fluoride
Detected: 0.13 MG/L (ppm)
7/11/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 4.4 MG/L (ppm)
7/11/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Nitrate-Nitrite
Detected: 4.4 MG/L (ppm)
7/11/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 19 MG/L (ppm)
7/11/2025
Potassium
Detected: 3.1 MG/L (ppm)
7/11/2025
Sodium
Detected: 26 MG/L (ppm)
7/11/2025
Calcium
Detected: 52 MG/L (ppm)
7/11/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 0.46 LANG
7/11/2025
Hardness, Total (ASCACO3)
Detected: 210 MG/L (ppm)
7/11/2025
Gross Alpha Particle Activity
Detected: 2.15 PCI/L
7/11/2025
pH
Detected: 8.1 PH
7/11/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
1, 2, 3-Trichloropropane
Detected: 0.0013 UG/L (ppb)
7/11/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 190 MG/L (ppm)
7/11/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 12.5 AGGR
7/11/2025
Alkalinity, Total
Detected: 190 MG/L (ppm)
7/11/2025
TDS
Detected: 350 MG/L (ppm)
7/11/2025
Conductivity (at 25°C)
Detected: 510 UMHO/CM
7/11/2025
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.