UKIAH is served by 3 water providers on file with the EPA.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for UKIAH, CA
3 water providers on file serving this city.
Quick answer: UKIAH's water has no violations on file and no single reading stands out against its peers (3 other providers in this area). It serves roughly 16,607 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
Nitrate
PFBS
PFHXS
PFOS
PFBA
PFHPA
PFOA
PFHXA
PFPEA
6:2 Fts
Aggressive Index
Magnesium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
Turbidity
pH
Odor
Totalhaloaceticacids (HAA5)
TTHM
Boron, Total
Iron
Chloroform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Monochloroaceticacid
Conductivity (at 25°C)
Color
Fluoride
Perfluorobutanesulfonicacid (PFBS)
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Chromium, Hex
Barium
Violations on file
Lead And Copper Rule Revisions
Currently open health violation
Found at 1 of 3 providers
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0 mg/L (ppm)
Found at 2 providers
Iron
Detected: 190 UG/L (ppb)
7/10/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Chromium, Hex
Detected: 0.157 UG/L (ppb)
7/23/2025
Barium
Detected: 120 UG/L (ppb)
7/10/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 19.7 UG/L (ppb)
10/6/2025
TTHM
Detected: 25.78 UG/L (ppb)
10/6/2025
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: 14.65 UG/L (ppb)
10/6/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromodichloromethane
Detected: 7.84 UG/L (ppb)
10/6/2025
Dibromochloromethane
Detected: 3.29 UG/L (ppb)
10/6/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 1 MG/L (ppm)
Found at 2 providers
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Chloride
Detected: 7.2 MG/L (ppm)
7/10/2025
Sulfate
Detected: 10 MG/L (ppm)
7/10/2025
Boron, Total
Detected: 160 UG/L (ppb)
7/10/2025
Fluoride
Detected: 0.1 MG/L (ppm)
7/10/2025
Often added deliberately for dental health; can also occur naturally.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 10 MG/L (ppm)
7/10/2025
Sodium
Detected: 9.7 MG/L (ppm)
7/10/2025
Calcium
Detected: 19 MG/L (ppm)
7/10/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 89 MG/L (ppm)
7/10/2025
pH
Detected: 7.05 PH
7/10/2025
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
PFBS
Detected: 0.0036 µg/L (ppb)
10/18/2023
PFHXS
Detected: 0.0036 µg/L (ppb)
10/18/2023
PFOS
Detected: 0.0043 µg/L (ppb)
10/18/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFBA
Detected: 0.0092 µg/L (ppb)
1/17/2023
PFHPA
Detected: 0.0033 µg/L (ppb)
1/17/2023
PFOA
Detected: 0.0069 µg/L (ppb)
1/17/2023
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXA
Detected: 0.0044 µg/L (ppb)
1/17/2023
PFPEA
Detected: 0.0051 µg/L (ppb)
1/17/2023
6:2 Fts
Detected: 0.0178 µg/L (ppb)
7/19/2023
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 94 MG/L (ppm)
7/10/2025
Other
Additional substances tested that don't fit neatly into the categories above
Aggressive Index
Detected: 10.7 AGGR
7/10/2025
Alkalinity, Total
Detected: 94 MG/L (ppm)
7/10/2025
TDS
Detected: 130 MG/L (ppm)
7/10/2025
Turbidity
Detected: 0.45 NTU
7/10/2025
A measure of water cloudiness from suspended particles.
Odor
Detected: 2.2 TON
7/10/2025
Dichloroaceticacid
Detected: 9.4 UG/L (ppb)
10/6/2025
Trichloroaceticacid
Detected: 10.3 UG/L (ppb)
10/6/2025
Dibromoaceticacid
Detected: 1.8 UG/L (ppb)
10/6/2025
Monochloroaceticacid
Detected: 3.6 UG/L (ppb)
7/14/2025
Conductivity (at 25°C)
Detected: 210 UMHO/CM
7/10/2025
Color
Detected: 10 UNITS
7/10/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 3.3 NG/L (ppt)
4/22/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 2 NG/L (ppt)
4/22/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 2.7 NG/L (ppt)
4/22/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Filtration considerations: General system types, not a specific product recommendation.