Water Quality Report · Updated October 07, 2026
MONTE VISTA WD
MONTE VISTA WD delivers tap water graded C (65/100) by TapWaterSafety.org. The utility serves approximately 56,017 residents in MONTCLAIR, California using surface water (purchased). The most significant water quality concerns are: Arsenic significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. For questions, the utility can be reached at 909-267-2125.
Is MONTCLAIR tap water safe to drink?
MONTE VISTA WD delivers tap water that earns a grade of C (65/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 56,017 residents in MONTCLAIR, drawing from surface water (purchased).
Public testing data identifies 16 contaminants in this water above EWG's health-based guidelines, including: Arsenic, Haloacetic acids (HAA5), Haloacetic acids (HAA9), Chromium (hexavalent), Total trihalomethanes (TTHMs), Bromodichloromethane, Dibromochloromethane, Dibromoacetic acid, Nitrate, Trichloroacetic acid, Chloroform, Bromoform, Dichloroacetic acid, 1,2-Dibromo-3-chloropropane (DBCP), 1,2,3-Trichloropropane, Uranium. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
EPA compliance record
Official U.S. EPA records for MONTE VISTA WD (system ID CA3610029) 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.
Quick actions for MONTCLAIR residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for MONTE VISTA WD.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 2.53 ppb, 633x 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.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 11.4 ppb, 190x above the EWG health guideline of 0.06 ppb.
Contact MONTE VISTA WD
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for MONTCLAIR
Filters matched to the specific contaminants in this water supply.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 65/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 |
2.53 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 633× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
11.4 ppb | 0.06 | — | — | — | — | — | 190× over |
| Chromium (hexavalent) Heavy metal |
2.64 ppb | 0.02 | — | — | — | — | — | 132× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
17.4 ppb | 0.15 | 80.0 | 100 | — | — | — | 116× over |
| Bromodichloromethane Disinfection byproduct |
4.4 ppb | 0.06 | — | — | — | — | — | 73× over |
| Dibromochloromethane Disinfection byproduct |
5.9 ppb | 0.1 | — | — | — | — | — | 59× over |
| Dibromoacetic acid Disinfection byproduct |
1.25 ppb | 0.03 | — | — | — | — | — | 42× over |
| Nitrate Inorganic |
3.21 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 23× over |
| Trichloroacetic acid Disinfection byproduct |
1.07 ppb | 0.1 | — | — | — | — | — | 11× over |
| Chloroform Disinfection byproduct |
3.36 ppb | 0.4 | — | — | — | — | — | 8.4× over |
| Bromoform Disinfection byproduct |
3.75 ppb | 0.5 | — | — | — | — | — | 7.5× over |
| Dichloroacetic acid Disinfection byproduct |
0.959 ppb | 0.2 | — | — | — | — | — | 4.8× over |
| 1,2-Dibromo-3-chloropropane (DBCP) Other |
0.0055 ppb | 0.0017 | 0.2 | — | — | — | — | 3.2× over |
| 1,2,3-Trichloropropane Other |
0.0011 ppb | 0.0007 | — | — | — | — | — | 1.6× over |
| Uranium Radiological |
0.44 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 1.0× over |
| Perchlorate Disinfection byproduct |
0.546 ppb | 1.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
5.73 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Bromochloromethane Other |
0.0121 ppb | 0.06 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
22.0 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
2.22 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Aluminum Heavy metal |
15.0 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.00542 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Manganese Heavy metal |
0.725 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Strontium Radiological |
0.276 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.16 ppm | — | 4.0 | 1.5 | 1.5 | — | — | 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
MONTE VISTA WD service area
This water system serves 1 community in San Bernardino County, California. Click any city for its dedicated tap water quality page.
Find the right filter for MONTCLAIR water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.