Water Quality Report · Updated October 07, 2026
MANTECA, CITY OF
MANTECA, CITY OF delivers tap water graded F (42/100) by TapWaterSafety.org. The utility serves approximately 84,928 residents in MANTECA, California using surface water (purchased). The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Arsenic significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline. For questions, the utility can be reached at 209-456-8468.
Is MANTECA tap water safe to drink?
MANTECA, CITY OF delivers tap water that earns a grade of F (42/100) from TapWaterSafety.org — a poor rating, with significant contamination concerns and/or recent violations.
The utility serves 84,928 residents in MANTECA, drawing from surface water (purchased).
Public testing data identifies 21 contaminants in this water above EWG's health-based guidelines, including: Perfluorooctane sulfonate (PFOS), Perfluorohexane sulfonate (PFHXS), Arsenic, Haloacetic acids (HAA9), Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Trichloroacetic acid, Chloroform, Chromium (hexavalent), Dichloroacetic acid, Bromodichloromethane, Nitrate, Uranium, 1,2-Dibromo-3-chloropropane (DBCP), 1,2,3-Trichloropropane, Dibromochloromethane, Dibromoacetic acid, Perfluorooctanoic acid (PFOA), Perfluoropentane sulfonic acid (PFPeS), Vanadium, Ethylene dibromide. 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 MANTECA, CITY OF (system ID CA3910005) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Nitrate Rule | Missed testing or reporting | 01/01/2024 | Open |
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 MANTECA residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for MANTECA, CITY OF.
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.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 6.78 ppt, 6777x above the EWG health guideline of 0.001 ppt.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 3.7 ppb, 926x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 22.0 ppb, 366x above the EWG health guideline of 0.06 ppb.
Contact MANTECA, CITY OF
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 MANTECA
Filters matched to the specific contaminants in this water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
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 42/100 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 |
|---|---|---|---|---|---|---|---|---|
| Perfluorooctane sulfonate (PFOS) PFAS |
5.6 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | EPA violation |
| Perfluorohexane sulfonate (PFHXS) PFAS |
6.78 ppt | 0.001 | 10.0 | — | — | — | — | 6777× over |
| Arsenic Heavy metal |
3.7 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 926× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
22.0 ppb | 0.06 | — | — | — | — | — | 366× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
36.4 ppb | 0.15 | 80.0 | 100 | — | — | — | 243× over |
| Trichloroacetic acid Disinfection byproduct |
13.2 ppb | 0.1 | — | — | — | — | — | 132× over |
| Chloroform Disinfection byproduct |
32.1 ppb | 0.4 | — | — | — | — | — | 80× over |
| Chromium (hexavalent) Heavy metal |
1.49 ppb | 0.02 | — | — | — | — | — | 75× over |
| Dichloroacetic acid Disinfection byproduct |
14.6 ppb | 0.2 | — | — | — | — | — | 73× over |
| Bromodichloromethane Disinfection byproduct |
2.81 ppb | 0.06 | — | — | — | — | — | 47× over |
| Nitrate Inorganic |
4.32 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 31× over |
| Uranium Radiological |
7.65 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 18× over |
| 1,2-Dibromo-3-chloropropane (DBCP) Other |
0.0297 ppb | 0.0017 | 0.2 | — | — | — | — | 17× over |
| 1,2,3-Trichloropropane Other |
0.00765 ppb | 0.0007 | — | — | — | — | — | 11× over |
| Dibromochloromethane Disinfection byproduct |
1.06 ppb | 0.1 | — | — | — | — | — | 11× over |
| Dibromoacetic acid Disinfection byproduct |
0.147 ppb | 0.03 | — | — | — | — | — | 4.9× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.232 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 2.6× over |
| Perfluoropentane sulfonic acid (PFPeS) PFAS |
2.21 ppt | 1.0 | — | — | — | — | — | 2.2× over |
| Vanadium Other |
30.3 ppb | 21.0 | — | — | — | — | — | 1.4× over |
| Ethylene dibromide Other |
0.0106 ppb | 0.01 | 0.05 | — | — | — | — | 1.1× over |
| Bromoform Disinfection byproduct |
0.417 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
84.4 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
138.9 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
0.703 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.814 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.0719 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.913 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.0115 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.893 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.329 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.0994 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.0142 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
MANTECA, CITY OF service area
This water system serves 1 community in San Joaquin County, California. Click any city for its dedicated tap water quality page.
Find the right filter for MANTECA water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.