Placer County Water Quality: 4 Cities Ranked by the Records
Placer County, California: 4 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
Highest result for each contaminant
One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.
LithiumDetected in 1 system of 4 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest62.6 µg/L
- CITY OF ROSEVILLE62.6 µg/LSample date: 2023-08-24 to 2024-05-09
- CITY OF LINCOLNNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-07-02 to 2025-04-09
- PLACER CWA - AUBURN/BOWMANNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-01-09 to 2025-01-28
- PLACER CWA - FOOTHILLNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-01-10 to 2025-07-23
Perfluorooctanesulfonic acid (PFOS)Detected in 1 system of 4 tested4.0 ng/L federal MCL (2024) · US EPAHighest4.3 ng/L
- CITY OF LINCOLN4.3 ng/LSample date: 2024-07-02 to 2025-04-09
- CITY OF ROSEVILLENot detected · below 4.0 ng/L lab reporting limitSample date: 2023-08-24 to 2024-05-09
- PLACER CWA - AUBURN/BOWMANNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-01-09 to 2025-01-28
- PLACER CWA - FOOTHILLNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-01-10 to 2025-07-23
Perfluorohexanesulfonic acid (PFHxS)Detected in 1 system of 4 tested10 ng/L federal MCL (2024) · US EPAHighest8.5 ng/L
- CITY OF LINCOLN8.5 ng/LSample date: 2024-07-02 to 2025-04-09
- CITY OF ROSEVILLENot detected · below 3.0 ng/L lab reporting limitSample date: 2023-08-24 to 2024-05-09
- PLACER CWA - AUBURN/BOWMANNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-09 to 2025-01-28
- PLACER CWA - FOOTHILLNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-10 to 2025-07-23
Water hardnessDetected in 1 systemAesthetic, no federal health limit · USGSHighest3.5 gpg
- CITY OF ROSEVILLE3.5 gpgReporting year: 2025
28 substances tested, none detected in any systemShow
Tested in these 4 systems: CITY OF LINCOLN, CITY OF ROSEVILLE, PLACER CWA - AUBURN/BOWMAN, PLACER CWA - FOOTHILL
- 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- Lead (90th percentile)
- N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Perfluoro-3-methoxypropanoic acid (PFMPA)
- Perfluoro-4-methoxybutanoic acid (PFMBA)
- Perfluorobutanesulfonic acid (PFBS)
- Perfluorobutanoic acid (PFBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorohexanoic acid (PFHxA)
- Perfluorononanoic acid (PFNA)
- Perfluorooctanoic acid (PFOA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluoropentanoic acid (PFPeA)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.
0of 4 cities above the 15 µg/L action level
Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.
Lead in California1city reports hardness · Roseville, 3.5 gpg
None above 7 gpg, the USGS threshold for hard water. An aesthetic measure with no federal health limit.
Hard water explainedLargest water systems
Frequently asked
How does Placer County tap water compare across cities?
PurityMap ranks 4 cities in Placer County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Roseville's main water system: CITY OF ROSEVILLE · PWSID CA3110008 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.
How many Placer County cities had a PFAS sample above a 2024 EPA limit?
1 of 4 Placer County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Lincoln (PFOS 4.3 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 1.
Is there lead in Placer County tap water?
Utilities report lead as a 90th-percentile result from home taps. 0 of 4 Placer County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
Does Placer County have hard water?
Hardness is published in utility water-quality reports for 1 Placer County city on record; the hardest is Roseville at 3.5 grains per gallon. Hardness affects scale and appliances; it is not a health finding.
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