N.H. Admin. Code § Env-Ws 341.01
(a) "Exemption" means an exception from compliance to allow a public water system extra time to comply with a new national primary drinking water regulation (NPDWR), as described in 42 U.S.C. 300g-5.
(b) "Variance" means an exception from compliance to allow a public water system to deviate from the maximum contaminant level (MCL) of an NPDWR under certain conditions when exceptionally poor source water conditions prevent compliance with that NPDWR , as described in 42 U.S.C. 300g-4.
Honest
(c) "Unreasonable risk to health" means a situation where:
(1) The MCL for E. coli would be exceeded;
(2) The MCL for any other contaminant would be exceeded by a factor of 5 or more; or
(3) If no MCL has been established, the health risk posed by the expected conditions would exceed a reasonable risk as determined using epidemiological studies.
N.H. Admin. Code § Env-Ws 341.01
(See Revision Note at chapter heading Env-Ws 300) #6521, eff 6-4-97; ss by #8360, INTERIM, eff 6-4-05, EXPIRES: 12 -1-05 ; ss by #8497, eff 11-030-05