CITY OF SIOUX FALLS 2023 WATER QUALITY DATA
|
INORGANIC CHEMICALS
|
PARAMETER (UNIT)
|
MCLG
|
MCL
|
LEVEL FOUND
|
RANGE
|
POSSIBLE SOURCE
|
Arsenic (PPM)
|
0
|
0.010
|
0.005
|
|
Erosion of natural deposits, orchards, glass, and electronics production wastes.
|
Barium (PPM)
|
2
|
2
|
0.015
|
|
Erosion of natural deposits.
|
Chromium (PPM)
|
0.100
|
0.100
|
<0.001
|
|
Erosion of natural deposits.
|
Fluoride (PPM)
|
<4
|
4
|
0.62
|
0.5–1.81
|
Additive to promote strong teeth.
|
Nitrate (PPM)
|
10
|
10
|
0.48
|
|
Runoff from fertilizer use; erosion of natural deposits.
|
|
LEAD AND COPPER (SAMPLES COLLECTED IN 2021)
|
PARAMETER (UNIT)
|
MCLG
|
ACTION LEVEL
|
90% OF VALUES
LESS THAN
|
NO. OF SITES
ABOVE AL
|
POSSIBLE SOURCE OF SUBSTANCE
|
Lead (PPB)
|
0
|
15
|
<1
|
0 out of 50
|
Corrosion of household plumbing systems.
|
Copper (PPM)
|
1.3
|
1.3
|
0.06
|
0 out of 50
|
Corrosion of household plumbing systems.
|
|
DISINFECTANTS/DISINFECTION BY-PRODUCTS
|
PARAMETER (UNIT)
|
MRDLG
|
MCL
|
LEVEL FOUND
|
RANGE
|
POSSIBLE SOURCE OF SUBSTANCE
|
Total Chlorine (PPM)
|
4
|
4.0
|
2.77
|
2.46–3.09
|
Water additive used to control microbes.
|
TTHMs (Total Trihalomethanes) (PPB)
|
N/A
|
80
|
31.69
|
22–40
|
By-product of drinking water chlorination.
|
HAA (Haloacetic Acids) (PPB)
|
N/A
|
60
|
10.9
|
8.8–16
|
By-product of drinking water chlorination.
|
|
MICROBIOLOGICAL
|
PARAMETER (UNIT)
|
MCLG
|
MCL
|
MAXIMUM LEVEL FOUND
|
POSSIBLE SOURCE OF SUBSTANCE
|
Total Coliform Bacteria
(present/absence)
|
Present in no samples
|
5% or more of samples
per month are positive
|
Present in 0.8% of samples
in one month
|
Naturally present in the environment.
|
Turbidity (NTU)
|
N/A
|
Determined by
treatment technology
|
100% of samples were
within limits. Highest = 0.11
|
Soil runoff.
|
|
ORGANIC CARBON
|
PARAMETER (UNIT)
|
MCLG
|
MCL
|
REMOVAL RATIO
|
RANGE
|
POSSIBLE SOURCE OF SUBSTANCE
|
Total Organic Carbon (PPM)
|
N/A
|
TT
|
1.66
|
1.02–2.24
|
Naturally present in the environment.
|
|
RADIOLOGICAL
|
PARAMETER (UNIT)
|
MCLG
|
MCL
|
LEVEL FOUND
|
YEAR SAMPLED
|
POSSIBLE SOURCE OF SUBSTANCE
|
Beta/Photon Emitters (pCi/L)
|
0
|
50
|
4.7
|
2021
|
Decay of natural and man-made deposits.
|
|
UNREGULATED CHEMICALS
|
PARAMETER (UNIT)
|
MCLG
|
MCL
|
LEVEL FOUND
|
YEAR SAMPLED
|
POSSIBLE SOURCE OF SUBSTANCE
|
Lithium
|
Unregulated
|
70.9
|
2023
|
Erosion of natural deposits.
|
|
LEWIS AND CLARK REGIONAL WATER SYSTEM WATER QUALITY DATA
|
PARAMETER (UNIT)
|
MCLG
|
MCL
|
LEVEL FOUND
|
RANGE
|
POSSIBLE SOURCE OF SUBSTANCE
|
Fluoride (PPM)
|
4
|
4
|
0.54
|
054–0.80
|
Additive to promote strong teeth.
|
Nitrate (PPM)
|
10
|
10
|
0.41
|
|
Runoff from fertilizer, leaching from septic tanks, sewage, and naturally present in the environment.
|
|