COBB AREA COUNTY WATER DISTRICT Water Quality Report
Serving roughly 3,515 people in Lake County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for COBB AREA COUNTY WATER DISTRICT
1 water provider directly on file, serving roughly 3,515 people in Lake County, California.
Quick answer: COBB AREA COUNTY WATER DISTRICT currently has an open health-based violation on file: Lead And Copper Rule Revisions, a compliance issue since 10/17/2024. This is active, not historical — see the violation detail below for what EPA's enforcement record shows.
Lead Summary
Copper Summary
TTHM
Lead
Chloroform
Copper, Free
Aggressive Index
Magnesium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Chloride
Turbidity
pH
Odor
Conductivity (at 25°C)
Color
Sulfate
Fluoride
Gross Alpha Particle Activity
Iron
Manganese
Vanadium, Total
Aluminum
Utility COBB AREA COUNTY WATER DISTRICTPopulation served 3,515Owner Local government
Open violation on file
Violations on file
Lead And Copper Rule Revisions
Currently open health violation
Found at 1 of 1 provider
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2024
Copper Summary
Detected: 1.5 mg/L (ppm)
06/30/2009
Lead
Detected: 9.3 UG/L (ppb)
9/21/2025
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.
Copper, Free
Detected: 63 UG/L (ppb)
9/22/2025
Iron
Detected: 1100 UG/L (ppb)
10/6/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Manganese
Detected: 89 UG/L (ppb)
10/6/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Vanadium, Total
Detected: 3.9 UG/L (ppb)
7/21/2025
Aluminum
Detected: 190 UG/L (ppb)
7/21/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 1.62 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: 1.62 UG/L (ppb)
8/18/2025
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: 1.4 MG/L (ppm)
7/21/2025
Sulfate
Detected: 0.94 MG/L (ppm)
7/21/2025
Fluoride
Detected: 0.19 MG/L (ppm)
1/14/2025
Often added deliberately for dental health; can also occur naturally.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 2.3 MG/L (ppm)
7/21/2025
Sodium
Detected: 4.6 MG/L (ppm)
7/21/2025
Calcium
Detected: 6.2 MG/L (ppm)
7/21/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 25 MG/L (ppm)
7/21/2025
pH
Detected: 7.34 PH
7/21/2025
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: 2.42 PCI/L
6/17/2025
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 38 MG/L (ppm)
7/21/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 10.11 AGGR
7/21/2025
Alkalinity, Total
Detected: 38 MG/L (ppm)
7/21/2025
TDS
Detected: 89 MG/L (ppm)
7/21/2025
Turbidity
Detected: 0.7 NTU
7/21/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 5 TON
7/21/2025
Conductivity (at 25°C)
Detected: 110 UMHO/CM
7/21/2025
Color
Detected: 7 UNITS
7/21/2025
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.