Ohio EPA recently completed a study of Scioto County Regional Water Authority’s source of drinking water, to identify potential contaminant sources and provide guidance on protecting the drinking water source.  According to this study, the aquifer (water rich zone) that supplies water to the water district has a high susceptibility to contamination.  This determination is based on the following: 

 -the presence of a relatively thin protective layer of soil overlying the aquifer; 

 -the depth to water in the aquifer is 10 to 15 ft below the ground surface;

 -the presence of numerous and significant potential contaminant sources in the protection area.   

This susceptibility means that under currently existing conditions, the likelihood of the aquifer becoming contaminated is relatively high.  This likelihood can be minimized by implementing appropriate protective measures.  More information about source water assessment or what consumers can do to help protect the aquifer is available by calling (740) 259-2301.

 

Here are some descriptions of abbreviations to help you better understand the table in this newsletter.  These are standard abbreviations, and are used by labs throughout the country. 

Parts per million (ppm) - one part per million corresponds to one minute in two years.

Parts per billion (ppb) - one part per billion corresponds to one minute in 2,000 years.

Less than = <

Maximum Contaminatan Level Goal (MCLG) is the level of contaminant in drinking water below which there is know known or expected risk to health.  MCLGs allow for a margin or safety.

Million fibers per liter (MFL) - number of fibers in a 1 liter sample

 

 

 

 

 

MCL’s are set at very stringent levels.  To understand the possible health  effects described for many regulated contaminants, a person would have to drink 2 liters of water every day at the MCL level for a lifetime to have a one-in-a-million chance of having the described health effect.

All drinking water, including bottled water, may reasonably be

expected to contain at least small amounts of some contaminants.

The presence of contaminants does not necessarily indicate that the water poses a health risk.  More information about contaminants and potential health effects can be obtained by calling the

Safe Drinking Water Hotline

1-800-426-4791.

Table of Detected Contaminants

 

MCLG

MCL

Level Found

Range of

Disinfectants

Violation

Year Sampled

Typical Source of Contamination

Range of Disinfectants

Chlorine

(ppm)

MRDLG

=4

MRDL

=4

1.35

0.92-1.53

No

2005

Water additive to control microbes

Inorganic Contaminants

Lead

(ppb)

0

Action Limit=15

<5.0

NA

No

2005

Corrosion of household plumbing systems; erosion of natural deposits.

Zero out of thirty samples were found to have lead levels in excess of the Action Level of 15 ppb

Copper

(ppb)

1,300

Action Limit =1,300

52

NA

No

2005

Corrosion of household pluming systems; erosion of natural deposits; leaching from wood preservatives.

Zero out of thirty samples were found to have copper levels in excess of the Action Level of 1,300 ppb

Nitrate

(ppm)

10

10

0.19

NA

No

2005

Runoff from fertilizer use; erosion of natural deposits

Fluoride

(ppm)

4

4

1.29

0.82-1.29

No

2005

Water additive which promotes strong teeth; erosion of natural deposits.

Asbestos

(MFL)

7

7

0.18

NA

No

2005

Decay of asbestos cement water mains; erosion of natural deposits.

Volatile Organic Contaminants

Total Trihalomethanes 

(ppb)

NA

80

7.72

NA

No

2005

By-product of drinking water chlorination

Five Haloacetic Acids

(ppb)

NA

60

39.82

NA

No

2005