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EF/ ICR Logo Levels of Treated Water Total Trihalomethanes for CALIFORNIA
OCTOBER - DECEMBER 1997


REMINDER: Data Purpose: The ICR data were collected as part of a national research project to support development of national drinking water standards. They should NOT be used to determine local water systems compliance with drinking water standards, nor should they be used to make personal judgements about individual health risks.

Units: Sample measurements are taken in micrograms per Liter (ug/L) and are regulated in milligrams per Liter (mg/L). A microgram per Liter is equivalent to one contaminant part per billion (ppb). A ppb can be thought of as one grain of salt in a swimming pool. Data for Total Trihalomethanes, haloacetic acids 5, and bromate are presented in ppb. 1 mg/L = 1000 ug/L, or 0.080 mg/L = 80 ug/L = 80 ppb, which happens to be the TTHM standard in the Stage 1 DBP Rule.

Calculation in Regulations is Different: Comparisons with compliance calculations based on the existing Total Trihalomethanes standard in CFR Part 141.30 may not be warranted since the standard i s based on an annual average of public water system quarterly averages and not on treatment plant results as shown here. Also the results here are based on different types of samples.

Results of Zero: A result of zero may indicate that a sample was analyzed, but that the result was less than the lowest value that the analytical method can reliably report.




Alameda County Water District

Water Type - GROUND WATER
(T reated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Blending Facility 135 Ground Water OCT 1997 - DEC 1997 45.2

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Mission San Jose WTP 137 Surface Water OCT 1997 - DEC 1997 90.6
WTP2 136 Surface Water OCT 1997 - DEC 1997 55.2



CITY OF LOS ANGELES

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Los Angeles Aqueduct Filtration Plant 163 Surface Water OCT 1997 - DEC 1997 34.5
Lower Stone Canyon Reservoir 166 Surface Water OCT 1997 - DEC 1997 28.6
River Supply Con duit 738 Surface Water OCT 1997 - DEC 1997 17.9
Upper Hollywood Reservoir 739 Surface Water OCT 1997 - DEC 1997 49.2



CITY OF SANTA BARBARA

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
W.B. CATER WTP 231 Surface Water OCT 1997 - DEC 1997 68.1



CITY OF VALLEJO

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Fleming Hill Water Treatment Plant 239 Surface Water OCT 1997 - DEC 1997 42.9



California Domestic Water Company

NO DATA - Click here to find out why.



California Water Service Co, Bakersfield

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Groundwater Trmt - Well #7-07 150 Ground Water OCT 1997 - DEC 1997 0



California-American Water Company

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Begonia Iron Removal Plant 182 Ground Water OCT 1997 - DEC 1997 50.3

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Carmel Valley Filter Plant 183 Surface Water OCT 1997 - DEC 1997 107.1



Castaic Lake Water Agency

NO DATA - Click here to find out why.



City of Anaheim

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Linda Vista Reservoir 186 Ground Water OCT 1997 - DEC 1997 34.9



City of Escondido

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Escondido - Vista WTP 215 Surface Water OCT 1997 - DEC 1997 72.8



City of Fresno, Water Division

NO DATA - Click here to find out why.



City of Fullerton

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Main Water Plant 187 Ground Water OCT 1997 - DEC 1997 3.2



City of Huntington Beach - Public Works

NO DATA - Click here to find out why.



City of Modesto

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
City of Modesto, Groundwater Treatment 243 Ground Water OCT 1997 - DEC 1997 11.9



City of Oceanside

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Robert A. Weese Filtration Plant 217 Surface Water OCT 1997 - DEC 1997 39



City of Riverside

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Grand Terrace 201 Ground Water OCT 1997 - DEC 1997 7.5



City of Sacramento

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Groundwater Treatment Plant 742 Ground Water OCT 1997 - DEC 1997 0

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
E.A. Fairbairn Water Treatment Plant 205 Surface Water OCT 1997 - DEC 1997 34.3



City of San Diego Water Utilities

NO DATA - Click here to find out why.



City of Santa Ana

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Groundwater Treatment 189 Ground Water OCT 1997 - DEC 1997 1.4



Coachella VWD: Cove

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Groundwater Treatment 196 Ground Water OCT 1997 - DEC 1997 .6



Contra Costa Water District

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Bollman Water Treatment Plant 146 Surface Water OCT 1997 - DEC 1997 39.1



Cucamonga County Water District

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Reservoir 1 (Chino Basin) 743 Ground Water OCT 1997 - DEC 1997 30

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Lloyd W. Michael WTP 208 Surface Water OCT 1997 - DEC 1997 51.2
Royer/Nesbit WTP 209 Surface Water OCT 1997 - DEC 1997 13.2



Dominguez Water Corp.

NO DATA - Click here to find out why.



EAST BAY MUNICIPAL UTILITY DISTRICT

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Layfayette Filter Plant 143 Surface Water OCT 1997 - DEC 1997 52.1
Orinda Filter Plant 138 Surface Water OCT 1997 - DEC 1997 47.2
Sobrante Filter Plant 141 Surface Water OCT 1997 - DEC 1997 61.9
Upper San Leandro Filter Plant 139 Surface Water OCT 1997 - DEC 1997 105.5
Walnut Creek Filter Plant 140 Surface Water OCT 1997 - DEC 1997 58.1



Helix Water District

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
R. M. Levy 216 Surface Water OCT 1997 - DEC 1997 49.8



LONG BEACH WATER DEPARTMENT

NO DATA - Click here to find out why.



Marin Municipal Water District

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Bon Tempe Treatment Plant 181 Surface Water OCT 1997 - DEC 1997 35.8
San Geronimo Water Treatment Plant 180 Surface Water OCT 1997 - DEC 1997 46.3



Metro Water Dist of So Calif

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
F. E. Weymouth FP 171 Surface Water OCT 1997 - DEC 1997 41.5
J. Jensen FP 168 Surface Water OCT 1997 - DEC 1997 47.2
R. A. Skinner FP 170 Surface Water OCT 1997 - DEC 1997 36
R. B. Diemer FP 169 Surface Water OCT 1997 - DEC 1997 33.6



North Bay Regional Water Treatment Plant

NO DATA - Click here to find out why.



Ontario-City of

NO DATA - Click here to find out why.



SONOMA COUNTY WATER AGENCY

NO DATA - Click here to find out why.



San Bernardino Municipal Water Dept.

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Newmark Pumping Plant 212 Ground Water OCT 1997 - DEC 1997 0



San Francisco Water Department

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Harry Tracy Water Treatment Plant 226 Surface Water OCT 1997 - DEC 1997 52.3



San Gabriel Valley WC - Fontana

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Sandhill Treatment Plant 214 Surface Water OCT 1997 - DEC 1997 0



San Gabriel Valley Water Company

Water Type - GROUND WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Various Wells Main San Gabriel Basin 153 Ground Water OCT 1997 - DEC 1997 0



San Jose Water Company

NO DATA - Click here to find out why.



San Juan Water District

Water Type - SURFACE WATER
(Treated Water)

Plant Name Plant ID Water Type Quarter Total Trihalomethanes Concentration (ppb)
Sidney N. Peterson WTP 206 Surface Water OCT 1997 - DEC 1997 29.2



Santa Clara Valley Water District

NO DATA - Click here to find out why.



Stockton East Water District

NO DATA - Click here to find out why.



Sweetwater Authority

NO DATA - Click here to find out why.



The City of Garden Grove

NO DATA - Click here to find out why.



Three Valleys Municipal Water District

NO DATA - Click here to find out why.



Water Facilities Authority

NO DATA - Click here to find out why.



Zone 7 Water Agency

NO DATA - Click here to find out why.



Results for mixed water (ground water and surface water) and purchased water can be found under water system summary reports.

How does this state's treated water compare to treated waters nationally for Total Trihalomethanes?
View national data for the same month.

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