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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Analysis of haloacetic acids (haa5) contamination levels across California cities
These cities have haloacetic acids (haa5) levels above 50% of the EPA limit but within compliance
| City | Level | % of Limit | Population |
|---|---|---|---|
| San Buenaventura | 44.60 ug/L | 74.3% | 110,763 |
| Manteca | 44.18 ug/L | 73.6% | 83,498 |
| Carlsbad | 42.71 ug/L | 71.2% | 115,382 |
| Santa Ana | 40.51 ug/L | 67.5% | 310,227 |
| Redlands | 39.67 ug/L | 66.1% | 71,941 |
| Santa Clara | 38.66 ug/L | 64.4% | 127,134 |
| Bellflower | 32.70 ug/L | 54.5% | 79,190 |
| Mission Viejo | 31.30 ug/L | 52.2% | 95,638 |
| Indio | 31.25 ug/L | 52.1% | 92,301 |
| Delano | 30.83 ug/L | 51.4% | 51,720 |
Showing 10 of 12 cities with elevated levels
Complete list of cities where haloacetic acids (haa5) has been detected, sorted by level
| City | Level | EPA Limit | % of Limit | Status |
|---|---|---|---|---|
| San BuenaventuraGrade F | 44.60 ug/L | 60.00 ug/L | 74.3% | Warning |
| MantecaGrade B- | 44.18 ug/L | 60.00 ug/L | 73.6% | Warning |
| CarlsbadGrade C+ | 42.71 ug/L | 60.00 ug/L | 71.2% | Warning |
| Santa AnaGrade C+ | 40.51 ug/L | 60.00 ug/L | 67.5% | Warning |
| RedlandsGrade C | 39.67 ug/L | 60.00 ug/L | 66.1% | Warning |
| Santa ClaraGrade D | 38.66 ug/L | 60.00 ug/L | 64.4% | Warning |
| BellflowerGrade B- | 32.70 ug/L | 60.00 ug/L | 54.5% | Warning |
| Mission ViejoGrade C- | 31.30 ug/L | 60.00 ug/L | 52.2% | Warning |
| IndioGrade F | 31.25 ug/L | 60.00 ug/L | 52.1% | Warning |
| DelanoGrade C+ | 30.83 ug/L | 60.00 ug/L | 51.4% | Warning |
| National CityGrade C+ | 30.31 ug/L | 60.00 ug/L | 50.5% | Warning |
| MaderaGrade C+ | 30.28 ug/L | 60.00 ug/L | 50.5% | Warning |
| LancasterGrade C- | 28.74 ug/L | 60.00 ug/L | 47.9% | Safe |
| Lake ForestGrade C+ | 28.11 ug/L | 60.00 ug/L | 46.9% | Safe |
| TemeculaGrade B+ | 26.02 ug/L | 60.00 ug/L | 43.4% | Safe |
| ArcadiaGrade C+ | 25.96 ug/L | 60.00 ug/L | 43.3% | Safe |
| AlamedaGrade F | 25.55 ug/L | 60.00 ug/L | 42.6% | Safe |
| Lake ElsinoreGrade A- | 25.46 ug/L | 60.00 ug/L | 42.4% | Safe |
| SanteeGrade B+ | 25.18 ug/L | 60.00 ug/L | 42.0% | Safe |
| RosevilleGrade B- | 25.07 ug/L | 60.00 ug/L | 41.8% | Safe |
| PetalumaGrade B- | 24.84 ug/L | 60.00 ug/L | 41.4% | Safe |
| Santa CruzGrade C+ | 24.80 ug/L | 60.00 ug/L | 41.3% | Safe |
| FontanaGrade B+ | 24.74 ug/L | 60.00 ug/L | 41.2% | Safe |
| PowayGrade C+ | 24.27 ug/L | 60.00 ug/L | 40.4% | Safe |
| TurlockGrade A- | 23.31 ug/L | 60.00 ug/L | 38.8% | Safe |
Showing 25 of 162 cities. View individual city pages for detailed reports.
Haloacetic acids are disinfection byproducts formed when chlorine or other disinfectants react with organic matter. The EPA regulates five HAAs (HAA5): monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid, and dibromoacetic acid. Studies have linked HAAs to increased cancer risk and potential developmental and reproductive effects. Dichloroacetic acid in particular has been shown to cause liver cancer in laboratory animals.
Formed during water disinfection when chlorine reacts with organic compounds; levels vary with source water quality and treatment processes
Based on our analysis of EPA Safe Drinking Water Information System (SDWIS) data and local water utility reports,haloacetic acids (haa5) has been detected in 162 California water systems. The average level across all tested cities is 21% of the EPA Maximum Contaminant Level (MCL), with the highest detection at 74.3% of the limit.
The EPA MCL for HAA5 is 60 ug/L (60 ppb). The EPA MCL for haloacetic acids (haa5) is 60 ug/L. This limit is set to protect public health based on available scientific evidence about the contaminant's health effects.
162 California cities have haloacetic acids (haa5) detected in their water supply. All tested cities are within EPA safety limits.
Increased cancer risk, potential liver damage, developmental effects. The most vulnerable groups include pregnant women and people with liver conditions.
The most effective methods for removing haloacetic acids (haa5) include Activated Carbon, Reverse Osmosis, Distillation. Look for filters certified by NSF/ANSI for haloacetic acids (haa5) reduction.
The EPA Maximum Contaminant Level (MCL) for haloacetic acids (haa5) is 60 ug/L.The EPA MCL for HAA5 is 60 ug/L (60 ppb).
Recommended filtration methods for haloacetic acids (haa5) removal:
Granular activated carbon effective for HAAs
Removes most HAAs
Effective removal