CheckPFAS

ZIP Code 92879

Moderate
Moderate PFAS Risk Level
15
PFAS Detected
0
Above EPA Limits
4
Water Systems
100%
Highest % of MCL

What this means for you

PFAS were detected at this water system, but below the EPA's Maximum Contaminant Level. "Below the limit" doesn't mean no risk — it means EPA considers the concentration acceptable across a lifetime of consumption at that level. Some people, particularly pregnant women, infants, and those with compromised immune systems, may wish to take additional precaution. Using a filter certified NSF/ANSI 58 for PFOA/PFOS reduction is a reasonable step that costs little and eliminates this variable entirely. Continue reading your utility's annual Consumer Confidence Report for year-to-year trends.

ELSINORE VALLEY MWD

CA3310012 Low Level
Water Type
MX
PFAS Detected
2
Above MCL
0
State
California
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
lithium
39000.00pptNo federal limitUnregulated
PFBA
Perfluorobutanoic acid
7.00pptNo federal limitUnregulated

RIVERSIDE, CITY OF

CA3310031 Low Level
Water Type
GU
PFAS Detected
4
Above MCL
0
State
California
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFOS
Perfluorooctane sulfonic acid
4.00ppt
100% of limit
4 pptBelow limit
lithium
9100.00pptNo federal limitUnregulated
PFPeA
Perfluoropentanoic acid
6.70pptNo federal limitUnregulated
PFHxA
Perfluorohexanoic acid
4.10pptNo federal limitUnregulated

CORONA, CITY OF

CA3310037 Moderate
Water Type
Groundwater
PFAS Detected
5
Above MCL
0
State
California
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFHxS
Perfluorohexane sulfonic acid
3.30ppt
33% of limit
10 pptBelow limit
lithium
55100.00pptNo federal limitUnregulated
PFBA
Perfluorobutanoic acid
7.60pptNo federal limitUnregulated
PFPeA
Perfluoropentanoic acid
6.10pptNo federal limitUnregulated
PFHxA
Perfluorohexanoic acid
3.80pptNo federal limitUnregulated

WESTERN MWD

CA3310049 Low Level
Water Type
MX
PFAS Detected
4
Above MCL
0
State
California
Data Period
2023–2025

PFAS Test Results

CompoundDetectedvs. EPA LimitEPA LimitStatus
PFHxS
Perfluorohexane sulfonic acid
3.40ppt
34% of limit
10 pptBelow limit
lithium
16000.00pptNo federal limitUnregulated
PFPeA
Perfluoropentanoic acid
4.70pptNo federal limitUnregulated
PFBS
Perfluorobutane sulfonic acid
3.00pptNo federal limitUnregulated
Note: ZIP code 92879 is served by 4 separate water utilities. Results above show data for each system independently.
About this data
Source
EPA UCMR 5 (Unregulated Contaminant Monitoring Rule, 5th cycle)
Data released
January 2026
Sampling period
January 2023 – December 2025
Systems tested
~10,000 public water systems serving > 25 people
Water systems (PWSID)
CA3310012, CA3310031, CA3310037, CA3310049
Detection threshold (MRL)
~1.5–2 ppt — "Not detected" means below this floor, not zero

Values shown are the highest single-sample concentration measured at entry points to the distribution system. Results reflect water quality at the treatment plant — aging pipes, building plumbing, and on-site storage can affect what actually reaches your tap.