Serving roughly 72,602 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for LAS VIRGENES MWD
1 water provider directly on file, serving roughly 72,602 people in Los Angeles County, California.
Quick answer: LAS VIRGENES MWD has no violations on file. One reading is worth knowing about: TTHM was measured at 74UG/L, among the highest of the 601 providers on file in this area. It's the most notable figure in this system's record among its 601 local peers.
Lead Summary
Lithium
Naphthalene
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Langelier Index (pH(s))
Magnesium
Calcium
Sodium
Hardness, Total (ASCACO3)
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Chloride
Sulfate
Utility LAS VIRGENES MWDPopulation served 72,602Owner 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)
12/31/2024
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 13 UG/L (ppb)
8/18/2025
TTHM
Detected: 74 UG/L (ppb)
8/18/2025
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: 9.1 UG/L (ppb)
8/18/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 17 UG/L (ppb)
8/18/2025
Bromodichloromethane
Detected: 18 UG/L (ppb)
8/18/2025
Dibromochloromethane
Detected: 30 UG/L (ppb)
8/18/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 45 MG/L (ppm)
5/21/2025
Sulfate
Detected: 75 MG/L (ppm)
2/19/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 19.4 MG/L (ppm)
8/20/2025
Calcium
Detected: 38.6 MG/L (ppm)
8/20/2025
Sodium
Detected: 77 MG/L (ppm)
8/20/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: -0.524 LANG
8/20/2025
Hardness, Total (ASCACO3)
Detected: 176 MG/L (ppm)
8/20/2025
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
Lithium
Detected: 15 µg/L (ppb)
2/22/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
Petroleum Compounds
Substances associated with fuel or petroleum contamination
Naphthalene
Detected: 1.3 UG/L (ppb)
1/21/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 230 MG/L (ppm)
8/20/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 4.3 UG/L (ppb)
8/18/2025
Trichloroaceticacid
Detected: 1.9 UG/L (ppb)
8/18/2025
Dibromoaceticacid
Detected: 6.3 UG/L (ppb)
8/18/2025
Alkalinity, Total
Detected: 190 MG/L (ppm)
8/20/2025
TDS
Detected: 370 MG/L (ppm)
8/20/2025
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.