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U.S. EPA National Drinking Water Contaminant Occurrence Database

August 1999 

Drinking Water Data

National

Surface Water

Contaminant/ PWS Size

Total Analyses

# Analyses w/Detects

# PWS w/Analyses

# PWS w/Detects

Units (UOM)

Min

Max

Median

Average

Std. Dev.

SODIUM
Small 501-3,300

1

0

1

0

Medium 3,301-10,000

2

2

2

2

UG/L

3

9500

9500

4751.5

6715.3931

Large 10,001-100,000

56

55

17

17

UG/L

3

47900

47900

8723.7909

14622.3431

All Systems

59

57

20

19

UG/L

3

47900

47900

8584.4123

14405.7559


Drinking Water Data

National

Ground Water

Contaminant/ PWS Size

Total Analyses

# Analyses w/Detects

# PWS w/Analyses

# PWS w/Detects

Units (UOM)

Min

Max

Median

Average

Std. Dev.

SODIUM
Very Small 0-500

16

16

15

15

UG/L

3

37800

37800

6606.0625

11045.6386

Small 501-3,300

13

13

11

11

UG/L

2

104000

104000

15993.6154

28238.5752

Medium 3,301-10,000

19

19

6

6

UG/L

3

115000

115000

20191.5263

35275.8205

Large 10,001-100,000

7

7

4

4

UG/L

3

170000

170000

24290.7143

64251.7559

All Systems

55

55

36

36

UG/L

2

170000

170000

15768.8727

33552.5264


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