Tap Water Quality Report
Tap water quality in MANTECA, California
Tap water in MANTECA, California receives a grade of F (42/100) from TapWaterSafety.org. It's served by MANTECA, CITY OF. 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. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in MANTECA's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving MANTECA.
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.
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.
Recommended filters for MANTECA
Filters matched to the specific contaminants in MANTECA's 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.
All contaminants detected in MANTECA'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 |
|---|---|---|---|---|---|---|---|---|
| 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, 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 MANTECA, CITY OF.