REDWOOD VALLEY COUNTY WATER DISTRICT Water Quality Report
Serving roughly 5,200 people in Mendocino County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for REDWOOD VALLEY COUNTY WATER DISTRICT
1 water provider directly on file, serving roughly 5,200 people in Mendocino County, California.
Quick answer: REDWOOD VALLEY COUNTY WATER DISTRICT has no violations on file. One reading is worth knowing about: TTHM was measured at 110.3UG/L, among the highest of the 265 providers on file in this area. It's the most notable figure in this system's record among its 265 local peers.
Lead Summary
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Copper, Free
Aggressive Index
Magnesium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Alkalinity, Carbonate
Hardness, Total (ASCACO3)
Carbon, Total
TDS
Chloride
Sulfate
Turbidity
pH
Odor
Conductivity (at 25°C)
Color
Fluoride
Boron, Total
Manganese
Utility REDWOOD VALLEY COUNTY WATER DISTRICTPopulation served 5,200Owner 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)
12/31/2025
Copper, Free
Detected: 64 UG/L (ppb)
9/10/2025
Manganese
Detected: 24 UG/L (ppb)
8/11/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 46.2 UG/L (ppb)
9/8/2025
TTHM
Detected: 110.3 UG/L (ppb)
9/8/2025
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: 99.21 UG/L (ppb)
9/8/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 11.09 UG/L (ppb)
9/8/2025
Dibromochloromethane
Detected: 1 UG/L (ppb)
9/8/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 9.4 MG/L (ppm)
8/11/2025
Sulfate
Detected: 8 MG/L (ppm)
8/11/2025
Fluoride
Detected: 0.11 MG/L (ppm)
8/11/2025
Often added deliberately for dental health; can also occur naturally.
Boron, Total
Detected: 140 UG/L (ppb)
8/11/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 8.3 MG/L (ppm)
8/11/2025
Sodium
Detected: 8.1 MG/L (ppm)
8/11/2025
Calcium
Detected: 16 MG/L (ppm)
8/11/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 73 MG/L (ppm)
8/11/2025
pH
Detected: 8.25 PH
10/6/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 77 MG/L (ppm)
10/6/2025
Alkalinity, Carbonate
Detected: 8 MG/L (ppm)
9/3/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 34.8 UG/L (ppb)
9/8/2025
Trichloroaceticacid
Detected: 11.4 UG/L (ppb)
9/8/2025
Dibromoaceticacid
Detected: 1.4 UG/L (ppb)
5/6/2025
Aggressive Index
Detected: 12.12 AGGR
8/11/2025
Alkalinity, Total
Detected: 77 MG/L (ppm)
10/6/2025
Carbon, Total
Detected: 1.77 MG/L (ppm)
10/6/2025
TDS
Detected: 94 MG/L (ppm)
8/11/2025
Turbidity
Detected: 1.7 NTU
9/3/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 10 TON
9/3/2025
Conductivity (at 25°C)
Detected: 170 UMHO/CM
8/11/2025
Color
Detected: 5 UNITS
10/6/2025
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.