Tap Water Quality Report
Tap water quality in TEMECULA, California
Tap water in TEMECULA, California receives a grade of F (47/100) from TapWaterSafety.org. It's served by RANCHO CALIFORNIA WATER DISTRICT. The most significant water quality concerns are: PFAS contamination; Arsenic significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Perfluorohexane sulfonate (PFHXS) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in TEMECULA's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving TEMECULA.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS), Perfluorooctanoic acid (PFOA) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 2.92 ppb, 731x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 36.2 ppb, 362x above the EWG health guideline of 0.1 ppb.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 0.213 ppt, 213x above the EWG health guideline of 0.001 ppt.
Recommended filters for TEMECULA
Filters matched to the specific contaminants in TEMECULA's water supply.
Reverse Osmosis or NSF P473 certified carbon
$80-$750Activated carbon and RO are the only technologies proven to remove PFAS at certified levels.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in TEMECULA's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Arsenic Heavy metal |
2.92 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 731× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Perfluorohexane sulfonate (PFHXS) PFAS |
0.213 ppt | 0.001 | 10.0 | — | — | — | — | 213× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
9.62 ppb | 0.06 | — | — | — | — | — | 160× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
21.8 ppb | 0.15 | 80.0 | 100 | — | — | — | 145× over |
| Bromodichloromethane Disinfection byproduct |
5.7 ppb | 0.06 | — | — | — | — | — | 95× over |
| Dibromochloromethane Disinfection byproduct |
5.7 ppb | 0.1 | — | — | — | — | — | 57× over |
| Chromium (hexavalent) Heavy metal |
0.863 ppb | 0.02 | — | — | — | — | — | 43× over |
| Dibromoacetic acid Disinfection byproduct |
0.955 ppb | 0.03 | — | — | — | — | — | 32× over |
| Nitrate Inorganic |
2.16 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 15× over |
| Trichloroacetic acid Disinfection byproduct |
1.48 ppb | 0.1 | — | — | — | — | — | 15× over |
| Chloroform Disinfection byproduct |
5.71 ppb | 0.4 | — | — | — | — | — | 14× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.879 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 9.8× over |
| Dichloroacetic acid Disinfection byproduct |
1.93 ppb | 0.2 | — | — | — | — | — | 9.6× over |
| Bromoform Disinfection byproduct |
4.43 ppb | 0.5 | — | — | — | — | — | 8.9× over |
| Uranium Radiological |
1.75 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 4.1× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.812 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 2.7× over |
| Radium, combined (-226 and -228) Radiological |
0.1 pCi/L | 0.05 | 5.0 | — | — | — | — | 2.0× over |
| Vanadium Other |
28.4 ppb | 21.0 | — | — | — | — | — | 1.4× over |
| Chlorate Disinfection byproduct |
44.8 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
5.11 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
37.6 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Selenium Heavy metal |
0.349 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Manganese Heavy metal |
1.15 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.0935 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.354 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.333 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.465 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
0.303 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.297 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
0.043 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
0.276 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.504 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.378 ppb | — | — | — | — | — | — | Below guideline |
| Lithium Other |
3.35 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from RANCHO CALIFORNIA WATER DISTRICT.