Serving roughly 6,059 people in Los Angeles County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for MAYWOOD MUTUAL WATER CO. #3
1 water provider directly on file, serving roughly 6,059 people in Los Angeles County, California.
Quick answer: MAYWOOD MUTUAL WATER CO. #3 has no violations on file. One reading is worth knowing about: 1, 4-Dioxane was measured at 4.7UG/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
PFOA
PFOS
PFHXS
Lithium
Iron
Manganese
Chromium, Hex
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Copper, Free
Aggressive Index
Potassium
Magnesium
Sodium
Hardness, Total (ASCACO3)
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
TDS
Chloride
Sulfate
Fluoride
Nitrate
Nitrate-Nitrite
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluoroheptanoicacid (PFHPA)
Perfluorohexanesulfonicacid (PFHxS)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
Turbidity
pH
1, 4-Dioxane
Trichloroethylene
Barium
Zinc
Conductivity (at 25°C)
Utility MAYWOOD MUTUAL WATER CO. #3Population served 6,059Owner 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
Iron
Detected: 43 UG/L (ppb)
5/28/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 25 UG/L (ppb)
4/23/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Chromium, Hex
Detected: 0.061 UG/L (ppb)
4/23/2025
Copper, Free
Detected: 100 UG/L (ppb)
8/4/2025
Barium
Detected: 110 UG/L (ppb)
4/23/2025
Zinc
Detected: 16 UG/L (ppb)
4/23/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 2.8 UG/L (ppb)
10/10/2025
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: 4.1 UG/L (ppb)
1/10/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 2.8 UG/L (ppb)
10/10/2025
Bromodichloromethane
Detected: 4.1 UG/L (ppb)
1/10/2025
Dibromochloromethane
Detected: 5.7 UG/L (ppb)
1/10/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 58 MG/L (ppm)
4/23/2025
Sulfate
Detected: 110 MG/L (ppm)
4/23/2025
Fluoride
Detected: 0.33 MG/L (ppm)
4/23/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 2.1 MG/L (ppm)
4/23/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Nitrate-Nitrite
Detected: 2.1 MG/L (ppm)
4/23/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Potassium
Detected: 3.1 MG/L (ppm)
4/23/2025
Magnesium
Detected: 16.2 MG/L (ppm)
4/23/2025
Sodium
Detected: 50 MG/L (ppm)
4/23/2025
Calcium
Detected: 75 MG/L (ppm)
4/23/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 254 MG/L (ppm)
4/23/2025
pH
Detected: 7.9 PH
4/23/2025
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
PFOA
Detected: 0.0073 µg/L (ppb)
8/11/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFOS
Detected: 0.0264 µg/L (ppb)
8/11/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXS
Detected: 0.0061 µg/L (ppb)
8/11/2025
Lithium
Detected: 9.77 µg/L (ppb)
8/12/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
VOCs (Volatile Organic Compounds)
Industrial solvents and fuel-related chemicals that evaporate easily
Trichloroethylene
Detected: 2.8 UG/L (ppb)
4/23/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 250 MG/L (ppm)
4/23/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 12.5 AGGR
4/23/2025
Alkalinity, Total
Detected: 200 MG/L (ppm)
4/23/2025
TDS
Detected: 530 MG/L (ppm)
4/23/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 31 NG/L (ppt)
4/23/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 8.5 NG/L (ppt)
4/23/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroheptanoicacid (PFHPA)
Detected: 2.1 NG/L (ppt)
4/23/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 6.9 NG/L (ppt)
4/23/2025
Perfluorohexanoicacid (PFHXA)
Detected: 2.8 NG/L (ppt)
4/23/2025
Perfluorobutanoicacid (PFBA)
Detected: 3.3 NG/L (ppt)
4/23/2025
Perfluoropentanoicacid (PFPEA)
Detected: 2.8 NG/L (ppt)
4/23/2025
Turbidity
Detected: 0.2 NTU
4/23/2025
A measure of water cloudiness from suspended particles.
1, 4-Dioxane
Detected: 4.7 UG/L (ppb)
4/23/2025
Conductivity (at 25°C)
Detected: 740 UMHO/CM
4/23/2025
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.