|
Results for Jan. 1, 2002 to Dec. 31, 2002
|
Disinfected
(with chlorine)
|
Treated at Richard A.
Reynolds Demineralization Plant
|
Treated at Robert A.
Perdue Water Treatment Plant
|
|
|
Inorganic Contaminants
|
MCL
[MRDL]
|
PHG
|
Range and Average
|
National City Well #2 (before treatment)
|
National City Well #3 (before treatment)
|
San Diego Formation Wells 1 thru 5 (before
treatment)
|
Lake Skinner Outlet (Aqueduct,
before treatment)
|
Sweetwater Reservoir (before treatment)
|
Sweetwater Authority Drinking Water (after
treatment)
|
Typical Source of Contaminant
|
|
Fluoride (ppm)
|
2
|
1
|
Range
|
0.34
|
0.40
|
0.13 -0.291
|
0.21 - 0.28
|
0.32
|
0.30
|
Erosion of natural deposits; discharge from
fertilizer and aluminum
|
|
Average
|
0.34
|
0.40
|
0.18
|
0.25
|
0.32
|
0.30
|
|
Nitrate-N (ppm)
|
10
|
10
|
Range
|
0.46
|
|
|
|
|
|
Runoff and leaching from fertilizer use; leaching
from septic tanks and sewage; erosion of natural deposits
|
|
Average
|
0.46
|
|
|
|
|
|
|
Aluminum (ppb)5
|
1000
|
600
|
Range
|
|
|
|
|
170
|
|
Erosion of natural deposits; residue from some
surface water treatment processes
|
|
Average
|
|
|
|
|
170
|
|
|
Arsenic (ppb)
|
50
|
NA
|
Range
|
|
|
2.3 - 33.01
|
2.1 - 2.8
|
2.2
|
|
Erosion of natural deposits; residue from some
surface water treatment processes
|
|
Average
|
|
|
9.71
|
2.4
|
2.2
|
|
|
Chromium (ppb)
|
50
|
(100)
|
Range
|
|
|
1.2 - 17.01
|
|
|
|
Discharge from steel and pulp mills; erosion of
natural deposits
|
|
Average
|
|
|
4.7
|
|
|
|
|
Lead (ppb) (more
info.)
|
AL = 15
|
2
|
Range
|
|
|
ND - 14.01
|
|
|
|
Discharges from industrial manufacturers, erosion
of natural deposits
|
|
Average
|
|
|
3.5
|
|
|
|
|
Nickel (ppb)
|
100
|
12
|
Range
|
|
|
3 - 161 |
|
|
|
Erosion of natural deposits; discharge from metals
factories
|
|
Average
|
|
|
7.5
|
|
|
|
|
Selenium (ppb)
|
50
|
(50)
|
Range
|
5.6 |
|
10 - 271
|
|
|
|
Refineries, mines and chemical waste discharges;
runoff
|
|
Average
|
5.6 |
|
15.4
|
|
|
|
|
Thallium (ppb)
|
2
|
0.1
|
Range
|
|
|
ND - 1.21
|
|
|
|
|
|
Average
|
|
|
ND
|
|
|
|
|
Radionuclides (a)
|
|
Gross Alpha (pCi/L)
|
15
|
(none)
|
Range
|
1.04 - 3.1
|
ND
|
ND - 12.11
|
ND - 6.221
|
2.71 - 5.01
|
|
Erosion of natural deposits
|
|
Average
|
2.0
|
ND
|
5.6
|
4.05
|
3.78
|
|
|
Uranium (pCi/L)
|
20
|
0.5
|
Range
|
|
|
|
ND - 3.671
|
|
|
|
|
Average
|
|
|
|
2.55
|
|
|
Turbidity (b)
|
|
Combined Filter Effluent Turbidity (NTU)
|
TT
|
no standard
|
Highest single measurement
|
0.32
|
Soil runoff
|
|
Lowest monthly percent of samples meeting MCL
|
100%
|
|
Unregulated Contaminants
|
|
Perchlorate (ppb)
|
NA
|
AL=4
|
Range
|
|
|
|
ND - 5
|
|
|
Industrial waste discharge
|
|
Average |
|
|
|
ND |
|
|
|
Vanadium (ppb)
|
NA
|
AL=50
|
Range
|
21.8 - 25.3
|
ND - 7.4
|
ND - 16.3
|
3 |
7.1 - 17.6
|
|
Naturally -occuring; Industrial waste discharge
|
|
Average |
23.6
|
3.7
|
8.5
|
3 |
12.2
|
|
|
Boron (ppb)
|
NA
|
AL = 1,000
|
Range
|
113 -149
|
215 - 238
|
176 - 438
|
120 - 140 |
109 - 183
|
|
Runoff/leaching from natural deposits; Industrial
wastes
|
|
Average |
131
|
226.5
|
314.0
|
130 |
147
|
|
|
Disinfection Byproducts and Disinfection
Residuals
|
|
Organic Chemical Contaminants
|
|
Total Trihalomethanes (TTHMs) (ppb)
|
80
|
NA
|
Highest running annual average (calculated each
quarter)
|
27
|
By-product of drinking water chlorination
|
|
Range of all distributed sample points
|
ND - 544
|
|
Haloacetic Acids (HAAs)(ppb)
|
60
|
NA
|
Highest running annual average (calculated each
quarter)
|
8.9
|
By-product of drinking water chlorination
|
|
Range of all distributed sample points
|
ND - 25.24
|
|
Chloramines (ppm)
|
[4.0]
|
[4]
|
Combined Distribution System Range
|
0.1 - 3.5
|
Drinking water disinfectant added for treatment
|
|
Combined Distribution System Average
|
2.1
|
|
Water Distribution Regulatory Compliance
Lead and Copper Rule |
# of sites found above AL
90 percent of samples below
|
90 percent of samples below
|
|
|
Lead (ppb)
|
AL=15
|
2
|
0 sites above AL out of 50 sites sampled
|
5.00
|
Corrosion of household plumbing systems
|
|
Copper (ppb)
|
AL=1300
|
170
|
0 sites above AL out of 50 sites sampled
|
501
|
Corrosion of household plumbing systems
|
|
Microbiological
(c)
|
Highest monthly percentage
|
|
|
Total Coliform Bacteria
|
5.0%
|
(0)
|
# of positive samples taken this year = 1
|
0.7
|
Naturally present in the environment
|
|
Fecal Coliform Bacteria
|
(c)
|
(0)
|
# of positive samples taken this year = 0
|
0
|
Human and animal fecal waste
|
|
Results for Jan. 1, 2002 to Dec. 31, 2002
|
Disinfected
(with chlorine)
|
Treated at Richard A.
Reynolds Demineralization Plant
|
Treated at Robert A.
Perdue Water Treatment Plant
|
|
|
Inorganic Contaminants
|
MCL
|
PHG
|
Range and Average
|
National City Well #2 (before treatment)
|
National City Well #3 (before treatment)
|
San Diego Formation Wells 1 thru 5 (before
treatment)
|
Lake Skinner Outlet (Aqueduct,
before treatment)
|
Sweetwater Reservoir (before treatment)
|
Sweetwater Authority Drinking Water (after
treatment)
|
Typical Source of Contaminant
|
|
Aluminum (ppb)
|
200
|
600
|
Range
|
|
|
|
|
170
|
|
Residue from water treatment process; natural deposits
erosion
|
|
Average
|
|
|
|
|
170
|
|
|
Iron (ppb)
|
300
|
NA
|
Range
|
|
162
|
33 - 12501
|
|
456
|
|
Leaching from natural deposits; industrial waste
|
|
Average
|
|
162
|
312
|
|
456
|
|
|
Manganese (ppb)
|
50
|
NA
|
Range
|
|
|
67 - 21501
|
|
39
|
|
Leaching from natural deposits
|
|
Average
|
|
|
|
|
39
|
|
|
Zinc (ppm)
|
5.0
|
NA
|
Range
|
|
|
ND - 0.0591
|
|
|
|
Runoff/leaching from natural deposits; industrial waste
|
|
Average
|
|
|
0.013
|
|
|
|
|
Specific Conductance
(microseimens/ centimeter)
|
1600
|
NA
|
Range
|
1117
|
1225
|
1999 - 50001
|
814 - 888
|
1053 |
433 - 1171
|
Substances that form ions when in water; seawater influence
|
|
Average
|
1117
|
1225
|
3049
|
836
|
1053
|
872
|
|
Total Dissolved Solids (ppm)
|
1000
|
NA
|
Range
|
572
|
675
|
1009 - 27121
|
486 - 531
|
647
|
257 - 649
|
Runoff/leaching from natural deposits; seawater influence
|
|
Average
|
572
|
675
|
1641
|
500
|
647
|
510 |
|
Chloride (ppm)
|
500
|
NA
|
Range
|
99 |
214 |
476 - 13281 |
71 - 85
|
107
|
127 - 157 |
Runoff/leaching from natural deposits; seawater influence
|
|
Average
|
99 |
214 |
759
|
75
|
107
|
143 |
|
Sulfate (ppm)
|
500
|
NA
|
Range
|
47 |
65 |
102 - 2851
|
167 - 189
|
185
|
12 - 196 |
Leaching/leaching from natural deposits; industrial waste
|
|
Average
|
47 |
65 |
198
|
179
|
185
|
80 |
| |
|
|
|
|
|
Other Parameters
|
MCL
|
PHG
|
Range and Average
|
National City Well #2 (before treatment)
|
National City Well #3 (before treatment)
|
San Diego Formation Wells 1 thru 5 (before
treatment)
|
Lake Skinner Outlet (Aqueduct,
before treatment)
|
Sweetwater Reservoir (before treatment)
|
Sweetwater Authority Drinking Water (after
treatment)
|
Typical Source of Contaminant
|
|
Sodium (ppm)
|
None
|
NA
|
Range
|
139
|
158
|
269 - 6921
|
73 - 82
|
113
|
68 - 149 |
Leaching from natural deposits; Industrial wastes
|
|
Average
|
139
|
158
|
393
|
77
|
113
|
149 |
|
Hardness -Total Hardness)(ppm)
|
None
|
NA
|
Range
|
180
|
208
|
298 - 6771
|
229 - 252
|
228
|
55 - 272 |
Leaching from natural deposits
|
|
Average
|
180
|
208
|
527
|
241
|
228
|
174 |
Radon
pCi/l6
|
|
No Standard
|
Range
|
270
|
270
|
|
|
|
|
Decay of natural deposits
|
|
Average
|
270
|
270
|
|
|
|
|
