WESTERN MWD - MURRIETA DIVISION Water Quality Report
Serving roughly 17,453 people in Riverside County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
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Results for WESTERN MWD - MURRIETA DIVISION
1 water provider directly on file, serving roughly 17,453 people in Riverside County, California.
Quick answer: WESTERN MWD - MURRIETA DIVISION has no violations on file. One reading is worth knowing about: Totalhaloaceticacids (HAA5) was measured at 18UG/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
PFOA
PFOS
PFHXS
Lithium
Magnesium
Potassium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Sulfate
Chloride
pH
Copper, Free
Zinc
Conductivity (at 25°C)
Turbidity
Radium-228
Combined Radium (-226 & -228)
Gross Alpha Particle Activity
Iron
Manganese
Arsenic
Color
Fluoride
Nitrate
Lead
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Utility WESTERN MWD - MURRIETA DIVISIONPopulation served 17,453Owner Local government
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0015 mg/L (ppm)
12/31/2025
Copper, Free
Detected: 7.5 UG/L (ppb)
10/6/2025
Zinc
Detected: 56 UG/L (ppb)
7/7/2025
Iron
Detected: 80 UG/L (ppb)
9/24/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 40 UG/L (ppb)
10/10/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Arsenic
Detected: 3.3 UG/L (ppb)
10/13/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Lead
Detected: 1.5 UG/L (ppb)
6/12/2025
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.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 18 UG/L (ppb)
5/6/2025
TTHM
Detected: 21 UG/L (ppb)
8/5/2025
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: 5.7 UG/L (ppb)
8/5/2025
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
Sulfate
Detected: 74 MG/L (ppm)
10/10/2025
Chloride
Detected: 150 MG/L (ppm)
10/10/2025
Fluoride
Detected: 0.6 MG/L (ppm)
9/2/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 0.26 MG/L (ppm)
2/4/2025
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: 18 MG/L (ppm)
10/10/2025
Potassium
Detected: 1.9 MG/L (ppm)
10/10/2025
Sodium
Detected: 110 MG/L (ppm)
10/10/2025
Calcium
Detected: 77 MG/L (ppm)
10/10/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 270 MG/L (ppm)
10/10/2025
pH
Detected: 8.1 PH
10/10/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Gross Alpha Particle Activity
Detected: 6.39 PCI/L
8/11/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFOA
Detected: 0.0055 µg/L (ppb)
2/26/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFOS
Detected: 0.0057 µg/L (ppb)
2/26/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXS
Detected: 0.0041 µg/L (ppb)
2/26/2025
Lithium
Detected: 32 µg/L (ppb)
5/8/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 210 MG/L (ppm)
10/10/2025
Other
Additional substances tested that don't fit neatly into the categories above
Alkalinity, Total
Detected: 210 MG/L (ppm)
10/10/2025
TDS
Detected: 580 MG/L (ppm)
10/10/2025
Conductivity (at 25°C)
Detected: 1000 UMHO/CM
10/10/2025
Turbidity
Detected: 0.83 NTU
9/24/2025
A measure of water cloudiness from suspended particles.
Radium-228
Detected: 0.649 PCI/L
8/11/2025
Combined Radium (-226 & -228)
Detected: 1.03 PCI/L
8/11/2025
A naturally occurring radioactive element found in some groundwater.
Color
Detected: 5 UNITS
9/24/2025
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.