.
WATER
QUALITY RESULTS
. |
| Substance |
Date Tested |
EPA's Standards |
Pocatello's Results |
Contaminant Source |
|
Detected
Inorganic
Chemicals - Primary Standards
(Directly related to the safety of drinking water.) |
| Nitrate
(ppm) |
12/21/99 |
|
|
Runoff from fertilizer use; leaching from septic tanks, sewage;
erosion of natural deposits. |
| Barium
(ppm) |
12/21/99 |
|
|
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 |
|
|
Erosion of natural deposits. |
| Beta/Photon
emitters (pCi/l) |
3/29/98 |
|
|
Decay of natural and man-made deposits. |
|
Volatile
Organic
Contaminants
(Includes petroleum-based chemicals, industrial by-products, and dry cleaning
solvents.) |
Tetrachloro-
ethylene (ppb) |
12/21/99 |
|
|
Leaching
from PVC pipes; discharge from factories and dry cleaners. |
Trichloro-
ethylene (ppb) |
12/21/99 |
|
|
Discharge
from metal degreasing sites and other factories. |
Total
Trihalo-
methanes (ppb) |
12/21/99 |
|
|
By-product
of drinking water chlorination. |
|
Lead
& Copper Sampling at Residential Water Taps |
| Lead
(ppb) |
12/15/99 |
|
|
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) |
12/15/99 |
|
|
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. |
We 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.
