CITY OF ARROYO GRANDE UTILITIES DIVISION Water Quality Report
Serving roughly 17,963 people in San Luis Obispo County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
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Results for CITY OF ARROYO GRANDE UTILITIES DIVISION
1 water provider directly on file, serving roughly 17,963 people in San Luis Obispo County, California.
Quick answer: CITY OF ARROYO GRANDE UTILITIES DIVISION has no violations on file and no single reading stands out against its peers (252 other providers in this area). It serves roughly 17,963 people, and the full breakdown below reflects everything EPA and California have on record for it.
Lead Summary
PFPEA
Lithium
PFHXS
PFOS
PFOA
PFHXA
PFBS
Manganese
Nitrate
Perfluorobutanesulfonicacid (PFBS)
Perfluoroheptanoicacid (PFHPA)
Perfluorohexanesulfonicacid (PFHxS)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
Iron
Totalhaloaceticacids (HAA5)
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Dichloroaceticacid
Trichloroaceticacid
Dibromoaceticacid
Copper, Free
Utility CITY OF ARROYO GRANDE UTILITIES DIVISIONPopulation served 17,963Owner 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)
12/31/2026
Manganese
Detected: 41 UG/L (ppb)
10/16/2025
Mainly a taste/staining concern at typical levels; long-term neurological research at high chronic exposure is ongoing.
Iron
Detected: 110 UG/L (ppb)
10/16/2025
Mostly an aesthetic issue (metallic taste, staining) rather than a health concern at typical levels.
Copper, Free
Detected: 130 UG/L (ppb)
9/30/2025
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
Totalhaloaceticacids (HAA5)
Detected: 34.6 UG/L (ppb)
8/12/2025
TTHM
Detected: 46.8 UG/L (ppb)
8/12/2025
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: 29.4 UG/L (ppb)
8/12/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 1.1 UG/L (ppb)
2/11/2025
Bromodichloromethane
Detected: 13.3 UG/L (ppb)
8/12/2025
Dibromochloromethane
Detected: 4.1 UG/L (ppb)
8/12/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Nitrate
Detected: 8 MG/L (ppm)
10/21/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFPEA
Detected: 0.0033 µg/L (ppb)
9/10/2024
Lithium
Detected: 14 µg/L (ppb)
9/10/2024
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFHXS
Detected: 0.0043 µg/L (ppb)
9/10/2024
PFOS
Detected: 0.0056 µg/L (ppb)
9/10/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFOA
Detected: 0.0046 µg/L (ppb)
9/10/2024
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFHXA
Detected: 0.0033 µg/L (ppb)
9/10/2024
PFBS
Detected: 0.011 µg/L (ppb)
9/10/2024
Other
Additional substances tested that don't fit neatly into the categories above
Perfluorobutanesulfonicacid (PFBS)
Detected: 32 NG/L (ppt)
3/27/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 5.3 NG/L (ppt)
3/27/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 9.5 NG/L (ppt)
3/27/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 9.3 NG/L (ppt)
3/27/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 9.1 NG/L (ppt)
3/27/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluorohexanoicacid (PFHXA)
Detected: 12 NG/L (ppt)
3/27/2025
Perfluorobutanoicacid (PFBA)
Detected: 6.2 NG/L (ppt)
3/27/2025
Perfluoropentanoicacid (PFPEA)
Detected: 13 NG/L (ppt)
3/27/2025
Dichloroaceticacid
Detected: 22.6 UG/L (ppb)
8/12/2025
Trichloroaceticacid
Detected: 10.5 UG/L (ppb)
8/12/2025
Dibromoaceticacid
Detected: 1.5 UG/L (ppb)
8/12/2025
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.