Use the NSI proficiency testing (PT) studies to help improve quality and comply with regulations. There are no limits on the number of analysts or number of methods that you may report. Receive your final reports within 21 days of the study close date.

These environmental chemistry soil and hazardous waste proficiency tests are designed for identification of target chemicals in the soil and underground storage tanks (UST).

If you have an immediate need for proficiency test results, PT Express™, our on-demand proficiency testing is available year-round. Call us at 1-800-234-7387 to place your order.

Each study contains at least 60% of the NELAC analytes plus a subset of the other analytes:
1,1,1,2-Tetrachloroethane: 20 to 200 µg/kg
1,1,1-Trichloroethane: 20 to 200 µg/kg
1,1,2,2-Tetrachloroethane: 20 to 200 µg/kg
1,1,2-Trichloro-1,2,2-trifluoroethane: 20 to 200 µg/kg
1,1,2-Trichloroethane: 20 to 200 µg/kg
1,1-Dichloroethane: 20 to 200 µg/kg
1,1-Dichloroethene: 20 to 200 µg/kg
1,1-Dichloropropene: 20 to 200 µg/kg
1,2,3-Trichlorobenzene: 20 to 200 µg/kg
1,2,3-Trichloropropane: 20 to 200 µg/kg
1,2,4-Trichlorobenzene: 40 to 200 µg/kg
1,2,4-Trimethylbenzene: 20 to 200 µg/kg
1,2-Dibromo-3-chloropropane: 40 to 200 µg/kg
1,2-Dibromoethane: 20 to 200 µg/kg
1,2-Dichlorobenzene: 20 to 200 µg/kg
1,2-Dichloroethane: 20 to 200 µg/kg
1,2-Dichloropropane: 20 to 200 µg/kg
1,3,5-Trichlorobenzene: 20 to 200 µg/kg
1,3,5-Trimethylbenzene: 20 to 200 µg/kg
1,3-Dichlorobenzene: 20 to 200 µg/kg
1,3-Dichloropropane: 20 to 200 µg/kg
1,4-Dichlorobenzene: 20 to 200 µg/kg
1,4-Dioxane: 160 to 400 µg/kg
1-Chlorohexane: 20 to 200 µg/kg
2,2-Dichloropropane: 20 to 200 µg/kg
2-Butanone: 100 to 500 µg/kg
2-Chloroethyl vinyl ether: 20 to 200 µg/kg
2-Chlorotoluene: 20 to 200 µg/kg
2-Hexanone: 100 to 500 µg/kg
3,3-Dimethyl-1-butanol: 20 to 200 µg/kg
4-Chlorotoluene: 20 to 200 µg/kg
4-Methyl-2-pentanone: 100 to 500 µg/kg
Acetone: 200 to 1000 µg/kg
Acetonitrile: 20 to 200 µg/kg
Acrolein: 20 to 200 µg/kg
Acrylonitrile: 20 to 200 µg/kg
Allyl chloride: 20 to 200 µg/kg
Benzene: 20 to 200 µg/kg
Bromobenzene: 40 to 200 µg/kg
Bromochloromethane: 20 to 200 µg/kg
Bromodichloromethane: 20 to 200 µg/kg
Bromoform: 20 to 200 µg/kg
Bromomethane: 80 to 200 µg/kg
Carbon disulfide: 20 to 200 µg/kg
Carbon tetrachloride: 20 to 200 µg/kg
Chlorobenzene: 20 to 200 µg/kg
Chloroethane: 80 to 200 µg/kg
Chloroform: 20 to 200 µg/kg
Chloromethane: 80 to 200 µg/kg
Chloroprene: 20 to 200 µg/kg
cis-1,2-Dichloroethene: 20 to 200 µg/kg
cis-1,3-Dichloropropene: 20 to 200 µg/kg
cis-1,4-Dichloro-2-butene: 20 to 200 µg/kg
Cyclohexane: 20 to 200 µg/kg
Dibromochloromethane: 20 to 200 µg/kg
Dibromomethane: 20 to 200 µg/kg
Dichlorodifluoromethane: 80 to 200 µg/kg
Diethyl ether: 20 to 200 µg/kg
Di-isopropylether: 20 to 200 µg/kg
Ethanol: 20 to 200 µg/kg
Ethyl methacrylate: 20 to 200 µg/kg
Ethylbenzene: 20 to 200 µg/kg
Ethyl-tert-butylether (ETBE): 20 to 200 µg/kg
Hexachlorobutadiene: 20 to 200 µg/kg
Hexachloroethane: 20 to 200 µg/kg
Iodomethane: 20 to 200 µg/kg
Isobutyl alcohol: 20 to 200 µg/kg
Isopropylbenzene: 40 to 200 µg/kg
Methacrylonitrile: 20 to 200 µg/kg
Methyl acetate: 20 to 200 µg/kg
Methyl cyclohexane: 20 to 200 µg/kg
Methyl methacrylate: 20 to 200 µg/kg
Methyl tert-butyl ether (MTBE): 20 to 200 µg/kg
Methylene chloride: 20 to 200 µg/kg
Naphthalene: 40 to 200 µg/kg
n-Butylbenzene: 20 to 200 µg/kg
n-Hexane: 20 to 200 µg/kg
n-Propylbenzene: 20 to 200 µg/kg
Pentachloroethane: 20 to 200 µg/kg
p-Isopropyltoluene: 20 to 200 µg/kg
Propionitrile: 20 to 200 µg/kg
sec-Butylbenzene: 20 to 200 µg/kg
Styrene: 40 to 200 µg/kg
t-Amyl alcohol: 20 to 200 µg/kg
T-amylmethylether (TAME): 20 to 200 µg/kg
t-Butyl alcohol: 20 to 200 µg/kg
tert-Butylbenzene: 20 to 200 µg/kg
Tetrachloroethene: 20 to 200 µg/kg
Tetrahydrofuran: 20 to 200 µg/kg
Toluene: 20 to 200 µg/kg
Total Xylenes: 40 to 400 µg/kg
trans-1,2-Dichloroethene: 20 to 200 µg/kg
trans-1,3-Dichloropropene: 20 to 200 µg/kg
trans-1,4-Dichloro-2-butene: 20 to 200 µg/kg
Trichloroethene: 20 to 200 µg/kg
Trichlorofluoromethane: 80 to 200 µg/kg
Vinyl acetate: 20 to 200 µg/kg
Vinyl chloride: 80 to 200 µg/kg

Lead time specified is for studies that have already opened. The lead time for studies that have not yet opened will be applicable once the study opens. To view study numbers and corresponding study dates, please see the 2024 Proficiency Testing Study Schedule linked under the Resources section below.