Water Quality
Treated Water Quality Data
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STOCKTON EAST WATER DISTRICT
DRINKING WATER QUALITY STANDARDS AND DEFINITIONS
Standards and monitoring requirements to safeguard water
quality are set by United States Environmental Protection Agency as
established in the U.S. Safe Drinking Water Act of 1974 and amendments. In
California, the Department of Health Services is the responsible agency
which can and often does, set more stringent standards then the federal
government. There are two types of drinking water standards:
- Primary Standards which are set based on research, data collection
and analysis by health experts to protect public health.
- Secondary Standards which are set based on aesthetic qualities of
water for example color, taste, odor, which may influence customer’s
acceptance of water.
The following definitions will help you better understand
the Annual Water Quality test results:
- PHG - Public Health Goal: The level of a contaminate in drinking
water below which there is no known or expected risk to health. PHGs are
set by the California Environmental Protection Agency.
- MCLG - Maximum Contaminate Level Goal: The level of a contaminant in
drinking water below which there is no known or expected risk to health.
MCLGs are set by the U.S.Environmental Protection Agency.
- MCL - Maximum Contaminate Level: The highest level of a contaminant
that is allowed in drinking water. MCLs are set as close to the PHGs amd
MCLGs
- DLR - Detection Limit Reported: The method chosen for determination
of a constituent must comply with a minimum detection set by the
Department of Health Services.
- *: MCLGs have not been finalized.
- NS - No Standard: At the present time, this parameter/constituent is
monitored, but a MCL has not been set.
- ND - Not Detected: This means that the parameter/constituent was
monitored, but was not found at or above the DLR.
- Turbidity: This is a measure of fine particles in water.
- <: This means less than.
- mg/l - milligram per liter: This is equivalent to
- 1 minute in 2 years
- 1 inch in 16 miles
- 1 cent in $10,000
- 1 black marble in 1,000,000 white marbles
2004 TREATED WATER QUALITY RESULTS
|
|
PARAMETERS/ CONSTITUENTS |
UNITS |
MCL |
DLR |
MCLG or (PHG) |
SURFACE WATER |
| AVG
|
RANGE |
| Inorganics
|
| Aluminum |
mg/l |
1 |
0.05 |
none |
0.155 |
|
| Antimony |
mg/l |
0.006 |
0.006 |
(0.020) |
<0.001 |
|
| Arsenic |
mg/l |
0.05 |
0.002 |
none* |
<0.002 |
|
| Asbestos |
fibers/l |
7 million |
0.2 million |
7 million |
<0.18 |
|
| Barium |
mg/l |
1 |
0.1 |
2 |
0.04 |
|
| Beryllium |
mg/l |
0.004 |
0.001 |
0.004 |
<0.002 |
|
| Cadmium |
mg/l |
0.005 |
0.001 |
0.005 |
<0.002 |
|
| Chromium |
mg/l |
0.05 |
0.01 |
0.1 |
<0.002 |
|
| Cyanide |
mg/l |
0.2 |
0.1 |
(0.15) |
<0.01 |
|
| Fluoride |
mg/l |
2 |
0.1 |
(1) |
<0.1 |
|
| Lead |
mg/l |
0.05 |
0.005 |
(0.002) |
0.0004 |
|
| Mercury |
mg/l |
0.002 |
0.001 |
0.002 |
<0.0002 |
|
| Nickel |
mg/l |
0.1 |
0.001 |
none |
<0.001 |
|
| Nitrate (as N)
|
mg/l |
10 |
0.4 |
(10) |
<0.4 |
|
| Nitrate (as
NO3) |
mg/l |
45 |
2 |
(45) |
<0.1 |
|
| Nitrite (as N)
|
mg/l |
1 |
0.4 |
(1) |
<0.1 |
|
| Selenium |
mg/l |
0.05 |
0.005 |
0.05 |
<0.002 |
|
| Thallium |
mg/l |
0.002 |
0.001 |
0.0005 |
<0.0002 |
|
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|
PARAMETERS/ CONSTITUENTS |
UNITS |
MCL |
DLR |
MCLG or (PHG) |
SURFACE WATER |
| AVG
|
RANGE |
|
Organics |
|
1,1,1-Trichloroethane (1,1,1-TCA) |
mg/l |
0.2 |
0.0005 |
0.200 |
ND |
|
|
1,1,2-Trichloroethane (1,1,2-TCA) |
mg/l |
0.005 |
0.0005 |
0.003 |
ND |
|
|
1,1-Dichloroethane (1,1-DCA) |
mg/l |
0.005 |
0.0005 |
none |
ND |
|
|
1,1-Dichloroethene (1,1-DCE) |
mg/l |
0.006 |
0.0005 |
0.007 |
ND |
|
|
1,2,4-Trichlorobenzene |
mg/l |
0.07 |
0.0005 |
(0.005) |
ND |
|
|
1,2-Dichlorobenzene (ortho) |
mg/l |
0.6 |
0.0005 |
(0.6) |
ND |
|
|
1,2-Dichloroethane (1,2-DCA) |
mg/l |
0.0005 |
0.0005 |
0 |
ND |
|
|
1,2-Dichloropropane |
mg/l |
0.005 |
0.0005 |
0 |
ND |
|
|
1,3-Dichloropropene |
mg/l |
0.0005 |
0.0005 |
none |
ND |
|
|
1,4-Dichlorobenzene (para) |
mg/l |
0.005 |
0.0005 |
(0.006) |
ND |
|
| 2,4-D |
mg/l |
0.07 |
0.01 |
(0.07) |
ND |
|
| Alachlor |
mg/l |
0.002 |
0.001 |
(0.004) |
ND |
|
| Atrazine |
mg/l |
0.003 |
0.001 |
0.003 |
ND |
|
| Bentazon |
mg/l |
0.18 |
0.002 |
none |
ND |
|
| Benzene |
mg/l |
0.001 |
0.0005 |
0 |
ND |
|
| Benzo(a)Pyrene
|
mg/l |
0.0002 |
0.0001 |
(0.000004) |
ND |
|
| Carbofuran
|
mg/l |
0.018 |
0.005 |
0.04 |
ND |
|
| Carbon
Tetrachloride |
mg/l |
0.0005 |
0.0005 |
0 |
ND |
|
| Chlordane |
mg/l |
0.0001 |
0.0001 |
(0.00003) |
ND |
|
| Chloroethene
(Vinyl Chloride) |
mg/l |
0.0005 |
0.0005 |
0 |
ND |
|
|
Cis-1,2-Dichloroethylene |
mg/l |
0.006 |
0.0005 |
0.07 |
ND |
|
| Dalapon |
mg/l |
0.2 |
0.01 |
(0.79) |
ND |
|
|
Di(2-ethylhexyl)Adipate |
mg/l |
0.4 |
0.005 |
0.4 |
ND |
|
|
Di(2-ethylhexyl)Phthalate |
mg/l |
0.004 |
0.003 |
(0.012) |
ND |
|
|
Dibromochloropropane (DBCP) |
mg/l |
0.0002 |
0.00001 |
0 |
ND |
|
|
Dichloromethane |
mg/l |
0.005 |
0.0005 |
0 |
ND |
|
| Dinoseb |
mg/l |
0.007 |
0.002 |
(0.014) |
ND |
|
| Dioxin
(2,3,7,8-TCDD) |
mg/l |
3X10-8 |
5X10-9 |
0 |
ND |
|
| Endrin |
mg/l |
0.002 |
0.0001 |
0.002 |
ND |
|
| Ethylbenzene
|
mg/l |
0.7 |
0.0005 |
(0.3) |
ND |
|
| Ethylene
Dibromide (EDB) |
mg/l |
0.00005 |
0.00002 |
0 |
ND |
|
| Glyphosate
|
mg/l |
0.7 |
0.025 |
(1) |
ND |
|
| Heptachlor
|
mg/l |
0.00001 |
0.00001 |
0 |
ND |
|
| Heptachlor
Epoxide |
mg/l |
0.00001 |
0.00001 |
0 |
ND |
|
|
Hexachlorobenzene |
mg/l |
0.001 |
0.0005 |
0 |
ND |
|
|
Hexachlorocyclopentadiene |
mg/l |
0.005 |
0.001 |
0.05 |
ND |
|
| Lindane |
mg/l |
0.002 |
0.0002 |
0.0002 |
ND |
|
| Methoxychlor
|
mg/l |
0.04 |
0.01 |
0.04 |
ND |
|
| Molinate |
mg/l |
0.02 |
0.002 |
none |
ND |
|
|
Monochlorobenzene |
mg/l |
0.07 |
0.0005 |
0.1 |
ND |
|
| Oxamyl |
mg/l |
0.2 |
0.02 |
(0.05) |
ND |
|
|
Pentachlorophenol |
mg/l |
0.001 |
0.0002 |
(0.0004) |
ND |
|
| Picloram |
mg/l |
0.5 |
0.001 |
(0.5) |
ND |
|
|
Polychlorinated Biphenyls (PCBs) |
mg/l |
0.0005 |
0.0005 |
0 |
ND |
|
| Silvex
(2,4,5-TP) |
mg/l |
0.05 |
0.001 |
0.05 |
ND |
|
| Simazine |
mg/l |
0.004 |
0.001 |
0.004 |
ND |
|
| Styrene |
mg/l |
0.1 |
0.0005 |
0.1 |
ND |
|
|
Tetrachloroethylene (PCE) |
mg/l |
0.005 |
0.0005 |
0 |
ND |
|
| Thiobencarb
|
mg/l |
0.07 |
0.001 |
none |
ND |
|
| Toluene |
mg/l |
0.15 |
0.0005 |
none |
ND |
|
| Toxaphene |
mg/l |
0.003 |
0.001 |
0 |
ND |
|
|
Trans-1,2-Dichloroethylene |
mg/l |
0.01 |
0.0005 |
0.1 |
ND |
|
|
Trichloroethylene (TCA) |
mg/l |
0.005 |
0.0005 |
0 |
ND |
|
|
Trichlorofluoromethane (Freon 11) |
mg/l |
0.15 |
0.005 |
(0.7) |
ND |
|
|
Trichlorotrifluoroethane (Freon 113) |
mg/l |
1.2 |
0.01 |
(4) |
ND |
|
|
Trihalomethanes, Total (TTHMs) |
mg/l |
0.1 |
0.0005 |
none |
ND |
|
| Xylenes (sum
of isomers) |
mg/l |
1.75 |
0.0005 |
(1.800) |
ND |
|
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| Microbiological |
|
PARAMETERS/ CONSTITUENTS |
UNITS |
MCL |
DLR |
MCLG or (PHG) |
SURFACE WATER |
| AVERAGE
|
RANGE |
| Coliform %
Positve Samples |
% |
5 |
|
zero |
0 |
|
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| Radiological |
|
PARAMETERS/ CONSTITUENTS |
UNITS |
MCL |
DLR |
MCLG or (PHG) |
SURFACE
WATER |
|
AVG
|
RANGE |
| Alpha
Activity, Gross |
pCi/l |
15 |
1 |
none* |
0.6 |
0.1-1.0 |
| Beta Activity,
Gross |
pCi/l |
50 |
4 |
none* |
3 |
|
| Strontium 90
|
pCi/l |
8 |
2 |
none* |
0.1 |
0-0.2 |
| Tritium |
pCi/l |
20000 |
1000 |
none* |
0.1 |
|
| Uranium |
pCi/l |
20 |
2 |
none* |
0 |
|
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| Secondary Standards |
|
PARAMETERS/ CONSTITUENTS |
UNITS |
MCL |
DLR |
MCLG or (PHG) |
SURFACE
WATER |
|
AVG
|
RANGE |
| Aluminum |
mg/l |
0.2 |
0.05 |
none |
0.155 |
|
| Chloride |
mg/l |
250 |
|
none |
3 |
|
| Color |
units |
15 |
|
none |
6 |
|
| Copper |
mg/l |
1 |
|
none |
ND |
|
| Foaming Agents
|
mg/l |
0.5 |
|
none |
<0.1 |
|
| Methyl
Tertiary Butyl Ether (MTBE) |
mg/l |
5.0 |
|
none |
ND |
|
| Odor-threshold
|
units |
3 |
|
none |
<1 |
|
| Silver |
mg/l |
0.1 |
0.01 |
none |
<0.001 |
|
| Specific
Conductance |
microhos |
900 |
|
none |
140 |
|
| Sulfate |
mg/l |
250 |
0.5 |
none |
8 |
|
| Thiobencarb
|
mg/l |
0.001 |
|
none |
<0.001 |
|
| Total
Dissolved Solids |
mg/l |
500 |
|
none |
115 |
|
| Turbidity |
units |
5 |
|
none |
1.8 |
|
| Zinc |
mg/l |
5.0 |
0.05 |
none |
<0.05 |
|
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| Additional Constituents |
|
PARAMETERS/ CONSTITUENTS |
UNITS |
MCL |
DLR |
MCLG or (PHG) |
SURFACE
WATER |
| AVG
|
RANGE |
| Alkalinity,
Total |
mg/l |
NS |
|
|
60 |
|
| Calcium |
mg/l |
NS |
|
|
13 |
|
| Hardness |
mg/l |
NS |
|
|
59 |
|
| Magnesium |
mg/l |
NS |
|
|
7 |
|
| pH |
units |
NS |
|
|
7.4 |
8.0-8.5 |
| Potassium |
mg/l |
NS |
|
|
<1 |
|
| Sodium |
mg/l |
NS |
|
|
6 |
|
|
ALL ANALYSES ARE NOT REQUIRED TO BE PERFORMED
EVERY YEAR. |
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Water quality leaving the Dr. Joe Waidhofer Water
Treatment meets all federal and state drinking water standards.
Stockton East Water District wholesales treated surface water to the City
of Stockton, California Water Service Company and San Joaquin County. If
you live in the Stockton urban area, you can contact your water provider
for water quality information reflecting your service area.
City of Stockton
(209) 937-8295
California Water Service Company
(209) 466-8971
San Joaquin County
(209) 468-3090
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