July
1998 Volume 21, Issue 7
EBMUD treated and untreated water
for 1997 drinking water
The tables below were taken from the EBMUD consumer report
of water quality, mailed to customers in June of 98. In addition to the tables, make sure
to check out the map of the reservoir service area to find
out which water supply you are getting.
Absent from the report from previous
water quality bulletins are the Chlorine in the treated water and sulfate concentrations.
We can probably assume that the Sulfate from the untreated water passes unchanged to the
treated water supply. As for the Chlorine content, their was a little blurb in a side
paragraph as follows:
"High odor levels occurred in the treated water
because of high chlorine residuals. With the chlorine removed, the odor levels of each
treatment plant were well within allowable levels. EBMUD's conversion from chlorine to
chloramine will significantly reduce or eliminate chlorinous odors." -p5: Water
Quality and Supply. 1998
I take this statement to mean that the chlorine doesn't get
listed anymore because its not mandated and the only indicator of it that persists is the
Threshold Odor Number. It is probably worth while contacting EBMUD to find out what the
chlorine concentration was just for curiosity.
Water Quality Constituents by Reservoir Source
Untreated Water
| Water Quality Constituent |
DLR |
MCL |
units |
Pardee |
San Pablo |
U.S.L. |
Briones |
| Arsenic |
0.002 |
0.05 |
mg/l |
ND |
ND |
ND-0.002 |
ND |
| Nitrate as N |
0.44 |
10 |
mg/l |
ND |
ND |
ND-.66 |
ND |
| Toluene |
0.0005 |
0.15 |
mg/l |
ND |
ND-0.0010 |
ND |
ND |
| Xylenes |
0.0005 |
1.75 |
mg/l |
ND |
ND-0.0007 |
ND |
ND |
| Chloride |
NS |
500 |
mg/l |
1-2 |
5-10 |
6-28 |
8-13 |
| Detergents |
NS |
0.5 |
mg/l |
ND |
0.04 |
0.03 |
ND |
| Sulfate |
NS |
500 |
mg/l |
0.9-1.8 |
16-26 |
17-32 |
76 |
| Total Dissolved Solids |
NS |
1000 |
mg/l |
28 |
130 |
120 |
240 |
| Calcium |
NS |
NS |
mg/l |
2.8-3.6 |
18.2 |
20.1-33.6 |
34.6 |
| Total Hardness |
NS |
NS |
mg/l |
9-14 |
55-84 |
77-140 |
81-140 |
| Magnesium |
NS |
NS |
mg/l |
0.9-1.4 |
7.4 |
8.9-14.1 |
10.6 |
| Sodium |
NS |
NS |
mg/l |
1.6-2.0 |
12.3 |
11.7-18.4 |
22.2 |
Water Quality Constituents by Treatment Plant
Treated Water
| Water Quality Consitituent |
DLR |
MCL |
Unit |
WTP AVG |
MIN |
MAX |
LAFAYETTE |
ORINDA |
SOBRANTES |
U.S.L |
WALNUT CREEK |
| Aluminum |
0.05 |
0.2 |
mg/l |
0.07 |
ND |
0.7 |
ND-0.14 |
ND-0.7 |
ND-0.07 |
0.07-0.14 |
ND-0.1 |
| Color |
NS |
15 |
units |
2 |
2 |
4 |
3 |
2 |
3 |
4 |
2 |
| Conductivity |
NS |
1600 |
umho/cm |
239 |
54 |
371 |
54 |
58-371 |
220 |
280 |
57 |
| Iron |
NS |
0.3 |
mg/l |
ND |
ND |
0.14 |
ND |
ND-0.14 |
ND |
ND-0.01 |
ND-0.02 |
| Magnesium |
NS |
0.05 |
mg/l |
ND |
ND |
0.01 |
ND |
ND-0.01 |
ND-0.001 |
ND-0.002 |
ND-0.001 |
| Threshold Odor # |
NS |
3 |
TON |
2 |
ND |
7 |
ND-5 |
1-7 |
1-7 |
1-7 |
1-4 |
| Turbity |
NS |
5 |
NTU |
0.07 |
ND |
0.22 |
ND-0.14 |
ND-0.22 |
ND-0.16 |
ND-0.2 |
ND-0.21 |
| Zinc |
NS |
5 |
mg/l |
0.01 |
ND |
0.04 |
ND-0.01 |
ND-0.04 |
ND-0.02 |
ND-0.02 |
ND-0.02 |
| Alkalinity |
|
|
mg/l |
26 |
17 |
74 |
18 |
17 |
70 |
74 |
17 |
| Boron |
|
|
mg/l |
0.03 |
0 |
0.122 |
0.003-0.016 |
0.004-0.113 |
0.010-0.074 |
0.066-0.114 |
0.005-0.122 |
| Calcium |
|
|
mg/l |
12.2 |
4.6 |
38.6 |
4.6-8.0 |
5.1-34.6 |
6.4-21.1 |
18.7-29.9 |
4.6-38.6 |
| Magnesium |
|
|
mg/l |
3.5 |
0.68 |
12.4 |
0.7-1.4 |
0.68-10.0 |
1.3-7.9 |
7.9-12.4 |
0.73-1.12 |
| Hardness |
|
|
mg/l |
38.1 |
11 |
130 |
13-35 |
11-130 |
55-79 |
63-130 |
12-130 |
| pH |
|
|
units |
8.4 |
7.8 |
9 |
7.8-8.4 |
8-8.7 |
8.2-8.5 |
7.8-8.4 |
8.1-9 |
| Potassium |
|
|
mg/l |
ND |
ND |
10.6 |
ND-10.6 |
ND-8.2 |
ND |
ND-8.8 |
ND-4.9 |
| Silica |
|
|
mg/l |
9.02 |
4.6 |
12.8 |
8.6-12.1 |
4.6-11.7 |
10.5-12.8 |
6.1-12.7 |
5.7-12.1 |
| Sodium |
|
|
mg/l |
10.1 |
3.3 |
31.6 |
3.3-4.8 |
3.4-26.1 |
4.6-24.5 |
17.6-31.6 |
2.7-31.1 |
Map of the Reservoir service
area
Glossary of Terms |
