South Dakota's Department of Agriculture and DENR have merged.
You are viewing an archived site, please update bookmarks and visit our new website at
SOUTH DAKOTA Department of
Agriculture & Natural Resources

Protecting South Dakota's Tomorrow...Today!
Joe Foss Building
523 E Capitol Ave
Pierre, SD 57501-3182
Contact Us  Field Offices

Drinking Water Program

Synthetic Organic Contaminants

Synthetic Organic Contaminants (SOCs) are man-made compounds used for a variety of industrial and agricultural purposes.  This group of contaminants includes pesticides, PCBs, and dioxin.  Synthetic Organic Contaminant health effects include damage to the nervous system, kidneys and cancer risks.


the Synthetic Organic Contaminant regulations apply to my water system?

If your water system is a community or non-transient non-community public water system, your water system is required to test for these organic contaminants.  Transient water systems do not have to test for these chemicals.

Frequency of Sampling

All community and non-transient non-community systems must test each entry point initially for four consecutive quarters.If there are no detections, then they can be reduced to sampling once every three years. For systems serving more than 3300 people, they must submit two consecutive quarterly samples every three years for each entry point.  Systems serving less than 3301 are required to submit one sample for each entry point once every three years. This sampling can be eliminated through waivers.

Actions your water system should be taking

If your water system detects a regulated synthetic organic contaminant in your drinking water they must: 

If the annual average of your water system’s tests indicate levels of a Synthetic Organic Contaminant higher than the maximum contaminant level (MCL), your system is in violation and they must: 

Maximum Contaminant Level

The Maximum Contaminant Levels for the Synthetic Organic Contaminants are listed below.

Contaminant                    Maximum Contaminant Level (MCL)

Alachlor  0.002
Aldicarb 0.003
Aldicarb sulfoxide 0.004
Aldicarb sulfone 0.002
Atrazine 0.003
Carbofuran 0.04
Chlordane 0.002
Dibromochloropropane 0.0002
2,4-D 0.07
Ethylene dibromide 0.00005
Heptachlor 0.0004
Heptachlor epoxide 0.0002
Methoxychlor 0.04
Polychlorinated Biphenyls (PCBs) 0.0005
Pentachlorophenol   0.001
Toxaphene 0.003
2,4,5-TP 0.05
Benzo[a]pyrene 0.0002
Dalapon 0.2
Di(2-ethylhexyl)adipate 0.2
Di(2-ethylhexyl)phthalate 0.006
Dinoseb 0.007
Diquat 0.7
Endothall 0.1
Endrin 0.002
Glyphosate 0.7
Hexacholorbenzene 0.001
Hexachlorocyclopentadiene 0.05
Oxamyl (Vydate) 0.2
Picloram 0.5
Simazine  0.004
2,3,7,8-TCDD (Dioxin) 3x10-8


Additional Information

Information on waivers can be found in 40 CFR 141.24(h)(5)