Table 6-3 Comparison of source water
quality to federal standards. The figures are averages. Actual quality may vary at different times and places.
WATER QUALITY CONSTITUENT
TUCSON WATER AVRA VALLEY WELLS
TUCSON WATER PRODUCTION WELLS
RAW CAP WATER
SECONDARY EFFLUENT
RECLAIMED WATER
EPA DRINKING WATER STANDARDS
Sodium (mg/l)
41.0
40.1
96.7
112
122
None
Fluoride (mg/l)
0.39
0.36
0.425
0.80
0.93
4.0 (MCL)
Total Dissolved Solids (mg/l)
210
282
611
547
655*
500 (SMCL)
Hardness (as CaCO3)
(mg/l)
84
129
266
141
217
None
Alkalinity (as CaCO3)
(mg/l)
124
129
105
229
222
None
pH
8.1
8.0
8.12
7.35
7.0
6.5-8.5 (SMCL)
Total Trihalomethanes
No Data
<5.0
<1.83
<3.24
<11.4
100 (MCL)
* Reclaimed water includes groundwater recovered from
the Sweetwater US&R Facility. Ambient groundwater is high in TDS. MCL—Maximum Contaminant Level (EPA Primary Standard) SMCL—Secondary
Maximum Contaminant Level
Sources: Adapted from Regional
Recharge Committee, Technical Report, Arizona Department of Water
Resources, Tucson Active Management Area, 1996.