Tap Water Quality Report
Tap water quality in CALABASAS, California
Tap water in CALABASAS, California receives a grade of D (67/100) from TapWaterSafety.org. It's served by LAS VIRGENES MWD. The most significant water quality concerns are: Haloacetic acids (HAA5) significantly above health guideline; Arsenic significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in CALABASAS's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving CALABASAS.
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.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 1.23 ppb, 308x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 12.2 ppb, 203x above the EWG health guideline of 0.06 ppb.
EPA compliance record
Official U.S. EPA records for LAS VIRGENES MWD (system ID CA1910225) for the last 3 years. Checked 2026-10-07.
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for CALABASAS
Filters matched to the specific contaminants in CALABASAS's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
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 CALABASAS'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 |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Arsenic Heavy metal |
1.23 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 308× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
12.2 ppb | 0.06 | — | — | — | — | — | 203× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
27.4 ppb | 0.15 | 80.0 | 100 | — | — | — | 183× over |
| Dibromoacetic acid Disinfection byproduct |
3.78 ppb | 0.03 | — | — | — | — | — | 126× over |
| Dibromochloromethane Disinfection byproduct |
9.86 ppb | 0.1 | — | — | — | — | — | 99× over |
| Bromodichloromethane Disinfection byproduct |
5.35 ppb | 0.06 | — | — | — | — | — | 89× over |
| Bromoform Disinfection byproduct |
9.19 ppb | 0.5 | — | — | — | — | — | 18× over |
| Chromium (hexavalent) Heavy metal |
0.34 ppb | 0.02 | — | — | — | — | — | 17× over |
| Dichloroacetic acid Disinfection byproduct |
2.33 ppb | 0.2 | — | — | — | — | — | 12× over |
| Chloroform Disinfection byproduct |
2.92 ppb | 0.4 | — | — | — | — | — | 7.3× over |
| Nitrate Inorganic |
0.599 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 4.3× over |
| Trichloroacetic acid Disinfection byproduct |
0.41 ppb | 0.1 | — | — | — | — | — | 4.1× over |
| Uranium Radiological |
0.6 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 1.4× over |
| Chlorate Disinfection byproduct |
172.3 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Bromochloromethane Other |
0.0246 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Vanadium Other |
3.91 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Aluminum Heavy metal |
50.6 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Molybdenum Other |
3.17 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.244 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.9 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Strontium Radiological |
0.41 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.672 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
1.25 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 LAS VIRGENES MWD.