Serving roughly 61,462 people in Yolo County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for CITY OF WOODLAND
1 water provider directly on file, serving roughly 61,462 people in Yolo County, California.
Quick answer: CITY OF WOODLAND has no violations on file. One reading is worth knowing about: Lithium was measured at 45.9µg/L, among the highest of the 218 providers on file in this area. It's the most notable figure in this system's record among its 218 local peers.
Lead Summary
Lithium
Copper, Free
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Aggressive Index
Langelier Index (pH(s))
Magnesium
Calcium
Sodium
Potassium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
Silica
Orthophosphate
Nitrogen-Ammoniaas (N)
Carbon, Total
Fluoride
Nitrate
Nitrate-Nitrite
Turbidity
Combined Uranium
Radium-228
Combined Radium (-226 & -228)
Gross Alpha Particle Activity
pH
Odor
Iron
Chromium, Hex
Chromium
Barium
Arsenic
Selenium
Conductivity (at 25°C)
Utility CITY OF WOODLANDPopulation served 61,462Owner Local government
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
12/31/2025
Copper, Free
Detected: 51 UG/L (ppb)
8/6/2025
Combined Uranium
Detected: 1.5 PCI/L
9/11/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Iron
Detected: 84 UG/L (ppb)
7/10/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Chromium, Hex
Detected: 18 UG/L (ppb)
9/18/2025
Chromium
Detected: 19 UG/L (ppb)
9/11/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Barium
Detected: 270 UG/L (ppb)
9/11/2025
Arsenic
Detected: 3.2 UG/L (ppb)
9/11/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Selenium
Detected: 15 UG/L (ppb)
9/11/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 3.1 UG/L (ppb)
7/10/2025
TTHM
Detected: 21 UG/L (ppb)
8/7/2025
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: 16 UG/L (ppb)
8/7/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 4 UG/L (ppb)
8/7/2025
Dibromochloromethane
Detected: 1 UG/L (ppb)
8/7/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 77 MG/L (ppm)
9/11/2025
Sulfate
Detected: 37 MG/L (ppm)
9/11/2025
Fluoride
Detected: 0.13 MG/L (ppm)
9/11/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 7.7 MG/L (ppm)
9/18/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Nitrate-Nitrite
Detected: 6.6 MG/L (ppm)
9/18/2025
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 57 MG/L (ppm)
9/11/2025
Calcium
Detected: 74 MG/L (ppm)
9/11/2025
Sodium
Detected: 76 MG/L (ppm)
9/11/2025
Potassium
Detected: 2.6 MG/L (ppm)
9/11/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Langelier Index (pH(s))
Detected: 0.76 LANG
9/11/2025
Hardness, Total (ASCACO3)
Detected: 420 MG/L (ppm)
9/11/2025
Orthophosphate
Detected: 1.1 MG/L (ppm)
8/7/2025
Gross Alpha Particle Activity
Detected: 4.66 PCI/L
9/11/2025
pH
Detected: 8 PH
9/11/2025
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
Lithium
Detected: 45.9 µg/L (ppb)
12/12/2024
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: 400 MG/L (ppm)
9/11/2025
Other
Additional substances tested that don't fit neatly into the categories above
Dichloroaceticacid
Detected: 1.3 UG/L (ppb)
7/10/2025
Trichloroaceticacid
Detected: 1.9 UG/L (ppb)
7/10/2025
Aggressive Index
Detected: 12.8 AGGR
9/11/2025
Alkalinity, Total
Detected: 400 MG/L (ppm)
9/11/2025
TDS
Detected: 680 MG/L (ppm)
9/11/2025
Silica
Detected: 20 MG/L (ppm)
8/7/2025
Nitrogen-Ammoniaas (N)
Detected: 0.71 MG/L (ppm)
8/7/2025
Carbon, Total
Detected: 0.82 MG/L (ppm)
8/7/2025
Turbidity
Detected: 0.35 NTU
8/7/2025
A measure of water cloudiness from suspended particles.
Radium-228
Detected: 1.17 PCI/L
8/7/2025
Combined Radium (-226 & -228)
Detected: 1.13 PCI/L
8/7/2025
A naturally occurring radioactive element found in some groundwater.
Odor
Detected: 1.2 TON
9/11/2025
Conductivity (at 25°C)
Detected: 1000 UMHO/CM
9/11/2025
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.