380
10.25
5.5
3
88
Lab Analysis
mg/L
Total Suspended Solids
0.23
0.12
2.1
6.6
0.65
27
2000
2000
60
600
12
9
45
Max Value
10
88
Lab Analysis
CFU/100 ml
Fecal Bacteria
10
88
Lab Analysis
CFU/100 ml
E. Coli Bacteria
28
25
86
IOWATER
Test Strip
mg/L
Chloride
60
60
60
14
87
IOWATER
Transparency Tube
Centimeters
Transparency
12
9.1
6.3
88
Lab Analysis
mg/L
Nitrate+Nitrite-N
0.08
0.05
88
Lab Analysis
mg/L
Total Phosphorus
18%
16
Lab Analysis
µg/L
Atrazine
9
8
7.8
6
88
IOWATER
Test Strip
pH units
pH
12
10
8
5
87
IOWATER Field
Kit
mg/L
Dissolved Oxygen
18%
16
Lab Analysis
µg/L
Metolachlor
0.61
0.46
0.34
0.13
88
Lab Analysis
mg/L
Total Kjeldahl Nitrogen
88
Lab Analysis
mg/L
Ammonia-N
38
36
32
20
87
Thermometer – Field
Degrees F
Water Temperature
% Detection
75th 
percentile
50th 
percentile
25th 
percentile
Min Value
# of Samples
Method
Unit
O’Brien County Snapshot Sampling Results – April 5, 2003.
mg/L = milligrams per liter (or parts per million – ppm);  µg/L = micrograms per liter (or  parts per billion – ppb)
CFU/100 ml = Colony Forming Units per 100 milliliters of water
The following pesticides were also analyzed at the 16 sites, however, no detections were reported:  cyanazine, alachlor, metribuzin, butylate, trifluralin, acetochlor, desethyl atrazine, desisopropyl atrazine, simazine, ametryn, EPTC, prometon, propachlor, dimethenamid.