Serving roughly 10,108 people in Riverside County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for SOUTH MESA WC
1 water provider directly on file, serving roughly 10,108 people in Riverside County, California.
Quick answer: SOUTH MESA WC has no violations on file. One reading is worth knowing about: Alkalinity, Carbonate was measured at 12MG/L, among the highest of the 451 providers on file in this area. It's the most notable figure in this system's record among its 451 local peers.
Lead Summary
PFHXA
PFPEA
PFBS
PFHXS
Totalhaloaceticacids (HAA5)
TTHM
Bromoform
Dibromochloromethane
Bromodichloromethane
Chloroform
Dibromoaceticacid
Copper, Free
Sodium
Hardness, Total (ASCACO3)
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Alkalinity, Carbonate
Magnesium
Potassium
TDS
Chloride
Sulfate
Fluoride
Nitrate-Nitrite
Nitrate
Radium-228
Combined Radium (-226 & -228)
pH
Odor
Vanadium, Total
Chromium, Hex
Perchlorate
Nickel
Arsenic
Conductivity (at 25°C)
Utility SOUTH MESA WCPopulation served 10,108Owner 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
Copper, Free
Detected: 120 UG/L (ppb)
9/9/2025
Vanadium, Total
Detected: 81 UG/L (ppb)
3/18/2025
Chromium, Hex
Detected: 1.8 UG/L (ppb)
3/18/2025
Nickel
Detected: 11 UG/L (ppb)
3/18/2025
Arsenic
Detected: 4.1 UG/L (ppb)
3/18/2025
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
Totalhaloaceticacids (HAA5)
Detected: 1 UG/L (ppb)
9/16/2025
TTHM
Detected: 3.4 UG/L (ppb)
9/16/2025
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.
Bromoform
Detected: 2.1 UG/L (ppb)
9/16/2025
Dibromochloromethane
Detected: 1.3 UG/L (ppb)
9/16/2025
Bromodichloromethane
Detected: 1.2 UG/L (ppb)
9/16/2025
Chloroform
Detected: 1.2 UG/L (ppb)
6/17/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 18 MG/L (ppm)
3/18/2025
Sulfate
Detected: 15 MG/L (ppm)
3/18/2025
Fluoride
Detected: 1.4 MG/L (ppm)
9/16/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate-Nitrite
Detected: 3 MG/L (ppm)
3/18/2025
Nitrate
Detected: 8.5 MG/L (ppm)
10/20/2025
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
Sodium
Detected: 66 MG/L (ppm)
3/18/2025
Calcium
Detected: 7 MG/L (ppm)
3/18/2025
Magnesium
Detected: 12 MG/L (ppm)
3/18/2025
Potassium
Detected: 1.4 MG/L (ppm)
3/18/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 18 MG/L (ppm)
3/18/2025
pH
Detected: 9.2 PH
3/18/2025
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
PFHXA
Detected: 0.0068 µg/L (ppb)
9/13/2023
PFPEA
Detected: 0.0089 µg/L (ppb)
9/13/2023
PFBS
Detected: 0.0047 µg/L (ppb)
9/13/2023
PFHXS
Detected: 0.0035 µg/L (ppb)
9/13/2023
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 110 MG/L (ppm)
3/18/2025
Alkalinity, Carbonate
Detected: 12 MG/L (ppm)
3/18/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dibromoaceticacid
Detected: 1 UG/L (ppb)
9/16/2025
Alkalinity, Total
Detected: 110 MG/L (ppm)
3/18/2025
TDS
Detected: 150 MG/L (ppm)
3/18/2025
Radium-228
Detected: 0.471 PCI/L
8/13/2025
Combined Radium (-226 & -228)
Detected: 0.633 PCI/L
8/13/2025
A naturally occurring radioactive element found in some groundwater.
Odor
Detected: 1 TON
3/18/2025
Perchlorate
Detected: 1.1 UG/L (ppb)
3/18/2025
Can occur naturally or from industrial/military sources; may interfere with thyroid function at elevated levels.
Conductivity (at 25°C)
Detected: 320 UMHO/CM
3/18/2025
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.