The Wellfield Protection Program is designed to protect the public drinking water supplies from hazardous chemicals called regulated substances. A list of the regulated substances is found in Appendix A of Article XIII of the Natural Resource Protection Code (Chapter 27). Facilities that store, use, handle or produce regulated substances in the wellfield zones are required to obtain a Hazardous Material Wellfield License and they are routinely inspected. The license requires recordkeeping, notifications, training, ground water and raw water monitoring and a spill contingency plan.

Appendix A Regulated Substances

Acenapthene	Dichlorobromomethane	Nickel (exc. elem. metal)
Acenapthylene	1, 1-Dichloroethane	Nicotine
Acephate	1, 2-Dichloroethane	Nitrates
Acrolein	1, 1-Dichloroethylene	Nitrobenzene;
Acrylonitrile	1, 2-cis-Dichloroethene	2-Nitrophenol
Aldicarb	1, 2-Trans-Dichloroethylene	4-Nitrophenol
Aldrin	2, 4-Dichlorophenol	N-Nitrosodimethylamine
Allyl alcohol	1, 2-Dichloropropane	N-Nitrosodi-n-propylamine
Aluminum phosphide	1, 3-Dichloropropylene	N-Nitrosodimethylamine
Anthracene	Dicrotophos	Oxamyl
Antimony	Diedldrin	Paraquat
Arsenic	Diethyl phthalate	Parathion
Asbestos (fibrous)	2, 4-Dimethylphenol	PCB-1242
Benzene	Dimethyl phthalate	PCB-1254
Benzidine	Di-n-butyl phthalate	PCB-1221
Benzo (a) anthracene	4, 6-Dinitro-o-cresol	PCB-1232
Benzo (b) pyrene	2, 4-Dinitrophenol	PCB-1248
3, 4-Benzofluoranthene	2, 4-Dinitrotoluene	PCB-1260
Benzo (ghi) perylene	2, 6-Dinitro toluene	PCB-1016
Benzo (k) fluoranthene	Di-n-octyl phthalate	Pentachlorophenol
Berylium (total)	Dioxathion	Petroleum Products
BHC-alpha	1, 2-Diphenylhydrazine	Phenanthrene
BHC-beta	Disulfoton;	Phenol
BHC-delta	Endolsulfan (alpha)	Phenols (total)
BHC (lindane) gamma	Endosulfan (beta)	Phorate
bis (2-chloroethoxy) methane	Endosulfan sulfate	Phosacetim
bis (2-chloroethyl) ether	Endothall (amine formulations)	Phosphamidon
bis (2-chloroisopropyl) ether	Endrin	Phosphorous
bis (2-Ethylhexyl) phthalate	Endrin aldehyde	Picloram
Bromoform	EPN	Pyrene
4-Bromophenyl phenylether	Ethoprop	Selenium (total)
Butylbenzyl phthalate	Ethyl benzene	Silver (exc. elem. metal)
Cadmium (total)	Ethylene dibromide	Silvex
Carbaryl	Fenamiphos	Sodium fluoracetate
Carbofuran	Fensulfothion	Strychnine
Carbon tetrachloride	Fenthion	Styrene
Chlordane	Fluoranthene	Sulfotepp
Chlordecone	Fluorene	TEPP
Chlorfenvinphos	Fluoracetamide-1081	Terbufos
Chlorobenzene	Fonofos	1, 1, 1, 2-Tetrachloroethane
p-Chloro-m-cresol	Gasoline	1, 1, 2, 2-Tetrachloroethane
Chlorodibromomethane	Guthion	Tetrachloroethylene
Chloroethane	Heptachlor	Thallium (total)
2-Chloroethylvinyl ether	Heptachlor epoxide	Toluene
Chloroform	Hexachlorobenzene	Toxaphene
2-Chloronapthalene	Hexachlorobutadiene	1, 2, 4-Trichlorobenzene
2-Chlorophenol	Hexachlorocyclopentodiene	1, 1, 1, -Trichloroethane
4-Chlorophenyl phenyl ether	Hexachloroethane	1, 1, 2-Trichloroethane
Chloropicrin	Hydrocyanic Acid	Trichloroethylene
Chromium (total)	Indeno (1, 2, 3-cd) pyrene	2, 4, 6-Trichlorophenol
Chromium (hexavalent)	Isophorone	Vinyl chloride
Chrysene	Isopropyl benzene	Xylene(s)
Clonitralid	Kerosene	Zinc (exec. elem. metal)
Copper (excluding elemental metal)	Lead (total)	Gasoline
Cyanide (total)	Malathion	Kerosene
Cycloheximide	Mercury (total)	Microbiological (including total and fecal coliform)
2, 4-D	Methamidophos	Petroleum products which are hazardous or toxic
4, 4'-DDD	Methidathion	Radionuclides
4, 4'-DDE	Methomyl
4, 4'-DDT	Methoxychlor
Demeton	Methyl bromide
Diazinon	Methyl chloride
Dibenzo (a, h) anthracene	Methyl parathion
1, 2-Dibromo-3-chloropropane	Methylene chloride
1, 2-Dichlorobenzene	Mevinphos
1, 3-Dichlorobenzene	Mirex
1, 4-dichlorobenzene	Monocrotophos
3, 3'-Dichlorobenzidine	Napthalene