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 wastewater proficiency tests are designed for identification of target chemicals in wastewater.

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.

The sample design will satisfy PT requirements for any of the following analytes:
1,1-Dichloroethane: 10 to 150 µg/L
1,1-Dichloroethene: 10 to 150 µg/L
1,1,1-Trichloroethane: 10 to 100 µg/L
1,1,1,2-Tetrachloroethane: 15 to 150 µg/L
1,1,2-Trichloroethane: 15 to 150 µg/L
1,1,2,2-Tetrachloroethane: 15 to 150 µg/L
1,2-Dibromo-3-chloropropane: 15 to 150 µg/L
1,2-Dichlorobenzene: 10 to 120 µg/L
1,2-Dichloroethane: 15 to 150 µg/L
1,2-Dichloropropane: 10 to 150 µg/L
1,2,3-Trichlorobenzene: 15 to 150 µg/L
1,2,3-Trichloropropane: 15 to 150 µg/L
1,2,4-Trichlorobenzene: 15 to 150 µg/L
1,2,4-Trimethylbenzene: 10 to 120 µg/L
1,3,5-Trimethylbenzene: 10 to 120 µg/L
1,3-Dichlorobenzene: 10 to 120 µg/L
1,4-Dichlorobenzene: 10 to 120 µg/L
1,4-Dioxane: 20 to 500 µg/L
2-Butanone: 5 to 500 µg/L
2-Chloroethyl vinyl ether: 5 to 500 µg/L
2-Hexanone: 20 to 200 µg/L
4-Methyl-2-pentanone: 20 to 200 µg/L
Acetone: 20 to 200 µg/L
Acetonitrile: 5 to 500 µg/L
Acrolein: 5 to 500 µg/L
Acrylonitrile: 5 to 500 µg/L
Benzene: 10 to 120 µg/L
Bromodichloromethane: 10 to 100 µg/L
Bromoform: 10 to 100 µg/L
Bromomethane: 20 to 120 µg/L
Carbon disulfide: 5 to 500 µg/L
Carbon tetrachloride: 15 to 150 µg/L
Chlorobenzene: 10 to 120 µg/L
Chloroethane: 20 to 120 µg/L
Chloroform: 10 to 100 µg/L
Chloromethane: 20 to 120 µg/L
cis-1,2-Dichloroethene: 10 to 150 µg/L
cis-1,3-Dichloropropene: 10 to 120 µg/L
Dibromochloromethane: 10 to 100 µg/L
Dibromomethane: 10 to 120 µg/L
Dichlorodifluoromethane: 20 to 100 µg/L
Ethylbenzene: 10 to 120 µg/L
Ethylene dibromide: 10 to 120 µg/L
Methyl acetate: 5 to 500 µg/L
Methyl cyclohexane: 20 to 100 µg/L
Methylene chloride: 10 to 120 µg/L
m+p-Xylene: 10 to 150 µg/L
MTBE: 15 to 150 µg/L
Naphthalene: 15 to 150 µg/L
n-Hexane: 10 to 150 µg/L
o-Xylene: 10 to 150 µg/L
Styrene: 20 to 120 µg/L
Tetrachloroethene: 10 to 150 µg/L
Toluene: 10 to 120 µg/L
Total Xylenes: 20 to 300 µg/L
trans-1,2-Dichloroethene: 10 to 120 µg/L
trans-1,3-Dichloropropene: 10 to 120 µg/L
Trichloroethene: 10 to 100 µg/L
Trichlorofluoromethane: 20 to 120 µg/L
Vinyl acetate: 5 to 500 µg/L
Vinyl chloride: 20 to 120 µg/L

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.