Water Quality Reports > Los Angeles CA Drinking Water Quality Report
Water Quality Score
F
Los Angeles CA Drinking Water Quality
Water Quality Factors
  • Failed some Health Guidelines
  • Failed some Legal Limits
  • Met all Reporting and Monitoring Requirements
  • Uses Chlorine disinfectant


In 1960 California introduced the State Water Project (SWP) which includes 22 dams and reservoirs, a pumping plant, and a 444-mile-long aqueduct that carries water to southern California from the San Joaquin Valley. The SWP provides irrigation water to farms in the San Joaquin Valley and is a major supply source for Los Angeles and surrounding cities. The Colorado River also provides water that serves over 18 million customers in Los Angeles and surrounding cities. Thirty percent of California's total annual water supply comes from groundwater, and up to 60 percent in drought years.

The Los Angeles Department of Water and Power monitors its water supply for over 200 different contaminants throughout the year. When water does not meet established standards, it's treated to reduce contaminant levels. Apart from filtering and disinfecting the water, contaminant levels are also reduced through a process called blending which involves mixing water from different sources. Mountain streams usually contain significant amounts of animal waste, while groundwater may have high levels of radon. Many residents of Los Angeles are turning off their faucets and resorting to bottled water. However, bottled water regulations are nearly identical to those imposed on public drinking water. Los Angeles water exceeded legal limits for both Arsenic and potentially carcinogenic disinfectant by-products. It is also above health guidelines for radioactive elements. Experts agree that filtering your water is not only cost effective, but the safest route one can take.

Los Angeles, CA Drinking Water Top Suppliers

Water SupplierWater Supply SourcePopulation ServedService Connections
Los Angeles Co Ww Dist 40 Reg 38 Lake La
P.O. Box 1460 Alhambra, CA 91802
Purchased Surface Water 12,689 3,417
Los Angeles-City, Dept. Of Water & Power
P.O. Box 51111 Rm 1213 Los Angeles, CA 90051
Surface Water 4,094,764 692,223
Los Angeles Co Ww Dist 4 & 34-Lancaster
P.O. Box 1460 Alhambra, CA 91802
Purchased Surface Water 146,709 46,706
Los Angeles Co Ww District 29 & 80-Malib
P.O. Box 1460 Alhambra, CA 91802
Purchased Surface Water 55,725 7,520
Data Sources:
EPA 2012 SDWIS Report

Los Angeles, CA Water Quality Recent Violations

There were no health violations for in the 2010-2012 reporting periods

There were no reporting, montioring or other reported violations for in the 2010-2012 reporting periods

To see the latest EPA monitoring report for visit the EPA at SDWIS Report
To see the latest EPA monitoring report for visit the EPA at SDWIS Report
To see the latest EPA monitoring report for visit the EPA at SDWIS Report
To see the latest EPA monitoring report for visit the EPA at SDWIS Report

Los Angeles, CA Water Quality Historical Violations

Detected
43
Above Health Limits
7
Below Limits
34
ContaminantTotal Tests Positive ResultsAbove Health LimitsAbove Legal LimitsEPA RegulatedMax ResultHealth Limit Legal Limit
Arsenic (total) 303 292 280 104 Yes 36.50 2 10
Total trihalomethanes (TTHMs) 303 268 0 6 Yes 119.41 - 80
Tetrachloroethylene 1749 657 657 0 Yes 2.30 0.06 5
Alpha particle activity 90 88 88 0 Yes 5.97 - 15
Arsenic (total) 85 59 54 0 Yes 8.10 2 10
Radium-226 65 53 47 0 Yes 1.26 0.05 5
Radium-228 63 49 47 0 Yes 3.04 0.02 5
Bromate 84 41 3 0 Yes 7.38 5 10
Lead (total) 16 1 1 0 Yes 12.90 0.20 15
1,1-Dichloroethylene 303 1 0 0 Yes 0.60 7 7
1,2,4-Trichlorobenzene 44 1 0 0 Yes 0.80 70 70
Aluminum 42 3 0 0 No 208 - -
Bromate 3 1 0 0 Yes 0.09 5 10
Bromide 99 49 0 0 No 220 - -
Bromodichloromethane 346 286 0 0 Yes 48.60 100 80
Bromoform 346 237 0 0 Yes 2.90 800 80
Carbon tetrachloride 1669 1 0 0 Yes 0.60 30 5
Chlorate 11 9 0 0 No 331 - -
Chlorine dioxide 3 3 0 0 No 2400 - -
Chloroform 346 287 0 0 Yes 62.30 70 80
Chromium (hexavalent) 116 77 0 0 Yes 8.97 - 100
Chromium (total) 370 46 0 0 Yes 35 100 100
Combined Uranium (pCi/L) 73 70 0 0 Yes 6.91 15 15
Copper 41 2 0 0 Yes 186 1300 1300
Di(2-ethylhexyl) phthalate 22 1 0 0 Yes 4.10 300 6
Dibromochloromethane 346 283 0 0 Yes 36.30 60 80
Dichloroacetic acid 8 1 0 0 Yes 1.90 70 60
Gross beta particle activity (pCi/L) 7 7 0 0 Yes 5.26 15 15
Manganese 308 9 0 0 No 43.40 300 -
Monochloroacetic acid 13 1 0 0 Yes 2.90 70 60
Nitrate 1831 1777 0 0 Yes 6.28 10 10
Nitrate & nitrite 137 12 0 0 Yes 3.52 10 10
Nitrite 20 1 0 0 Yes 0.00 1 1
Selenium (total) 59 2 0 0 Yes 8.67 50 50
Strontium-90 4 3 0 0 No 0.55 - -
Toluene 44 4 0 0 Yes 15.20 1000 1000
Total haloacetic acids (HAAs) 149 1 0 0 Yes 29 70 60
Total trihalomethanes (TTHMs) 43 13 0 0 Yes 43 - 80
Trichloroacetic acid 8 1 0 0 Yes 1 20 60
Trichloroethylene 1705 1185 0 0 Yes 3.80 300 5
Trichlorofluoromethane 303 38 0 0 No 6.75 2000 -
Tritium 3 3 0 0 No 167 - -
Vanadium 35 19 0 0 No 7.95 - -

82 Water Contaminants were tested for in the Los Angeles, CA area but not found in drinking water between 2004 and 2009.

Data Source: NYTimes.com

The scores and results above reflect a summary of the historical drinking water testing results that has been documented by the EPA and other sources. The color coding of the symbols was developed by WaterFilterComparisions.com as an easy way for individuals to gauge the historical effectiveness of Los Angeles water suppliers in meeting legal and health regulations in providing clean drinking water. This should only be used as a guide, and WaterFilterComparisons recommends you contact Los Angeles water suppliers to better understand the quality of the drinking water in Los Angeles, .