105 CMR 435.28
Bacterial Quality
The Board of Health may cause samples of swimming, wading, or specialpurpose poolwater for
bacteriologicalanalysis to be taken from the pool whenever it considers it necessary. All samples shall
becollected, dechlorinated and examined inaccordance with the procedure outlined in the latest edition
of the Standard Methods for the Examination of Water and Waste Water (APHA). The
bacteriological quality of the water from the pool shall meetthe followingstandards: No sample shall:
(1) contain more than 200 bacteria per milliliter, as determined by the standard (35°C) agar plate
count, or show a positive test (confirmed test) for coliform organisms in any of the five 10-milliliter
portions of a sample or more than 1.0 coliform organism per 50 milliliters when the membrane filter test
is used; and
(2) show a positive test (confirmed test) for pseudomonas aeruginosa organisms in any of the five 10
milliliter portions ofa sample or more than 1.0 pseudomonas aeruginosa organisms per 100 milliliters
when the membrane filter test is used.