N.H. Admin. Code Env, Env-Dw, ch. Env-Dw 700, pt. Env-Dw 723, app D

Current through Register No. 50, December 12, 2024

Appendix D - Monitoring Frequency for PFAS Contaminants Based on Specified MCL

Perfluorohexane sulfonic acid (PFHxS); MCL = 18 ng/L

Average Monitoring Result (ng/L)	Frequency
> 9 to 18	Annually
< 9	Every 3 years

Perfluorononanoic acid (PFNA); MCL = 11 ng/L

Average Monitoring Result (ng/L)	Frequency
> 5.5 to 11	Annually
< 5.5	Every 3 years

Perfluorooctane sulfonic acid (PFOS); MCL = 15 ng/L
Average Monitoring Result (ng/L)	Frequency
> 7.5 to 15	Annually
< 7.5	Every 3 years
Perfluorooctanoic acid (PFOA); MCL = 12 ng/L
Average Monitoring Result (ng/L)	Frequency
> 6 to 12	Annually
< 6	Every 3 years

N.H. Admin. Code Env, Env-Dw, ch. Env-Dw 700, pt. Env-Dw 723, app D