Pocatello Water Quality Summary: 1999


Link to the Pocatello Water DepartmentWe are pleased to present a summary of the quality of the water provided to you during the past year as a part of the 1996 Safe Drinking Water Act (SDWA) requirements that water utilities issue an annual "Consumer Confidence" report to customers. This report is based upon tests conducted by the City of Pocatello Water Department.


Substance Date Tested EPA's Standards Pocatello's Results
Min. Max.
Contaminant Source

Detected Inorganic Chemicals - Primary Standards
(Directly related to the safety of drinking water.)

Nitrate (ppm)


10.0 10.0
2.0 5.7
Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits.
Barium (ppm)




0.06 0.16
Discharge from drilling wastes; discharge from metal refineries; erosion of natural deposits.

Radioactive Contaminants
(Emitted from certain naturally occurring minerals as they decay.)

Alpha emitters (pCi/l) 12/30/98
0 15.0
ND 8.0

Erosion of natural deposits.

Beta/Photon emitters (pCi/l) 3/29/98
0 50.0
ND 18.0

Decay of natural and man-made deposits.

Volatile Organic Contaminants
(Includes petroleum-based chemicals, industrial by-products, and dry cleaning solvents.)

ethylene (ppb)
0 5.0
ND 1.3
Leaching from PVC pipes; discharge from factories and dry cleaners.
ethylene (ppb)
0 5.0
ND 4.5
Discharge from metal degreasing sites and other factories.
Total Trihalo-
methanes (ppb)
0 100.0
ND 14.3
By-product of drinking water chlorination.

Lead & Copper Sampling at Residential Water Taps

Lead (ppb)


AL = 15.0


<2.0 ppb 6.0 ppb
Corrosion of household plumbing systems; erosion of natural deposits.
90th percentile for lead = 0.91 ppm AND number of sites above the AL (15) = 1
Copper (ppm)


AL = 1.3


0.25 ppm

2.21 ppm

Corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives.
90th percentile for copper = 0.91 ppm AND number of sites above the AL (1.3) = 1

Note: The MCL for beta particles is 4 mrem/year. EPA considers 50 pCi/l to be the level of concern for beta particles. Unless otherwise noted, the data presented in the water quality data table is from testing done between January 1 - December 1999. The State requires us to monitor for certain contaminants less than once per year because the concentrations of these contaminants are not expected to vary significantly from year to year. Some of the data, though representative of the water quality, is more than one year old.