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 as least 60% of the NELAC analytes in the NELAC required range plus a subset of the other analytes:
1,1,1,2-Tetrachloroethane: 1000 to 10,000 µg/kg
1,1,1-Trichloroethane: 1000 to 10,000 µg/kg
1,1,2,2-Tetrachloroethane: 1500 to 10,000 µg/kg
1,1,2-Trichloroethane: 1000 to 10,000 µg/kg
1,1,2-Trichlro-1,2,2-trifluoroethane: 1500 to 15,000 µg/kg
1,1-Dichloroethane: 1000 to 10,000 µg/kg
1,1-Dichloroethene: 2000 to 10,000 µg/kg
1,1-Dichloropropene: 1500 to 15,000 µg/kg
1,2,3-Trichlorobenzene: 1500 to 15,000 µg/kg
1,2,3-Trichloropropane: 1500 to 10,000 µg/kg
1,2,4-Trichlorobenzene: 2000 to 10,000 µg/kg
1,2,4-Trimethylbenzene: 1000 to 20,000 µg/kg
1,2-Dibromo-3-chloropropane: 2000 to 10,000 µg/kg
1,2-Dibromoethane: 2000 to 10,000 µg/kg
1,2-Dichlorobenzene: 1000 to 10,000 µg/kg
1,2-Dichloroethane: 1500 to 10,000 µg/kg
1,2-Dichloropropane: 2000 to 10,000 µg/kg
1,3,5-Trichlorobenzene: 1500 to 15,000 µg/kg
1,3,5-Trimethylbenzene: 1000 to 20,000 µg/kg
1,3-Dichlorobenzene: 1000 to 10,000 µg/kg
1,3-Dichloropropane: 1500 to 15,000 µg/kg
1,4-Dichlorobenzene: 1000 to 10,000 µg/kg
1,4-Dioxane: 4000 to 20,000 µg/kg
1-Chlorohexane: 1500 to 15,000 µg/kg
2,2-Dichloropropane: 1500 to 15,000 µg/kg
2-Butanone: 4000 to 20,000 µg/kg
2-Chloroethyl vinyl ether: 1000 to 20,000 µg/kg
2-Chlorotoluene: 1500 to 15,000 µg/kg
2-Hexanone: 4000 to 20,000 µg/kg
3,3-Dimethyl-1-butanol: 1500 to 15,000 µg/kg
4-Chlorotoluene: 1500 to 15,000 µg/kg
4-Methyl-2-pentanone: 4000 to 20,000 µg/kg
Acetone: 4000 to 20,000 µg/kg
Acetonitrile: 1000 to 20,000 µg/kg
Acrolein: 1000 to 20,000 µg/kg
Acrylonitrile: 1500 to 15,000 µg/kg
Allyl chloride: 1500 to 15,000 µg/kg
Benzene: 1000 to 10,000 µg/kg
Bromobenzene: 2000 to 10,000 µg/kg
Bromochloromethane: 1500 to 15,000 µg/kg
Bromodichloromethane: 1000 to 10,000 µg/kg
Bromoform: 1000 to 10,000 µg/kg
Bromomethane: 2000 to 10,000 µg/kg
Carbon disulfide: 1000 to 20,000 µg/kg
Carbon tetrachloride: 1000 to 10,000 µg/kg
Chlorobenzene: 1000 to 10,000 µg/kg
Chloroethane: 2000 to 10,000 µg/kg
Chloroform: 1000 to 10,000 µg/kg
Chloromethane: 2000 to 10,000 µg/kg
Chloroprene: 1500 to 15,000 µg/kg
cis-1,2-Dichloroethene: 2000 to 10,000 µg/kg
cis-1,3-Dichloropropene: 2000 to 10,000 µg/kg
cis-1,4-Dichloro-2-butene: 1500 to 15,000 µg/kg
Cyclohexane: 1500 to 15,000 µg/kg
Dibromochloromethane: 1000 to 10,000 µg/kg
Dibromomethane: 2000 to 10,000 µg/kg
Dichlorodifluoromethane: 2000 to 10,000 µg/kg
Diethyl ether: 1500 to 15,000 µg/kg
Di-isopropylether: 1000 to 20,000 µg/kg
Ethanol: 1500 to 15,000 µg/kg
Ethyl methacrylate: 1500 to 15,000 µg/kg
Ethylbenzene: 1000 to 10,000 µg/kg
Ethyl-tert-butylether (ETBE): 1500 to 15,000 µg/kg
Hexachlorobutadiene: 1500 to 15,000 µg/kg
Hexachloroethane: 1500 to 15,000 µg/kg
Iodomethane: 1500 to 15,000 µg/kg
Isobutyl alcohol: 1500 to 15,000 µg/kg
Isopropylbenzene: 2000 to 10,000 µg/kg
Methacrylonitrile: 1500 to 15,000 µg/kg
Methyl acetate: 1000 to 20,000 µg/kg
Methyl cyclohexane: 1000 to 10,000 µg/kg
Methyl methacrylate: 1500 to 15,000 µg/kg
Methylene chloride: 1000 to 10,000 µg/kg
Methyl-tert-butyl ether (MTBE): 2000 to 10,000 µg/kg
Naphthalene: 2000 to 10,000 µg/kg
n-Butylbenzene: 1500 to 15,000 µg/kg
n-Hexane: 1500 to 15,000 µg/kg
n-Propylbenzene: 1500 to 15,000 µg/kg
Pentachloroethane: 1500 to 15,000 µg/kg
p-Isopropyltoluene: 1500 to 15,000 µg/kg
Propionitrile: 1500 to 15,000 µg/kg
sec-Butylbenzene: 1500 to 15,000 µg/kg
Styrene: 2000 to 10,000 µg/kg
t-Amyl alcohol: 1500 to 15,000 µg/kg
T-amylmethylether (TAME): 1000 to 20,000 µg/kg
t-Butyl alcohol: 1500 to 15,000 µg/kg
tert-Butylbenzene: 1500 to 15,000 µg/kg
Tetrachloroethene: 1000 to 10,000 µg/kg
Tetrahydrofuran: 1500 to 15,000 µg/kg
Toluene: 1000 to 10,000 µg/kg
Total Xylenes: 2000 to 20,000 µg/kg
trans-1,2-Dichloroethene: 2000 to 10,000 µg/kg
trans-1,3-Dichloropropene: 2000 to 10,000 µg/kg
trans-1,4-Dichloro-2-butene: 1500 to 15,000 µg/kg
Trichloroethene: 1000 to 10,000 µg/kg
Trichlorofluoromethane: 2000 to 10,000 µg/kg
Vinyl acetate: 1000 to 20,000 µg/kg
Vinyl chloride: 2000 to 10,000 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.