Table 1.

Number of samples found positive to total coliforms and E. coli in some tank.

Tank Number	Rainwater Use	Filter on Tank	Positive to Total Coliforms/8 Samples	Positive to E. coli/8 Samples	Total Coliforms: Minimum and Maximum Detection	E. coli: Minimum and Maximum Detection	Roof Material	Tank Material	TV Antenna on Rooftop	Hanging Canopy
1	Drinking	No	8	6	18.5–2419.6	1.0–59.1	Galvanized	Galvanized	Yes	No
2	Drinking	Yes (before filter)	8	6	1046.2–613.1	866.4–461.1	Galvanized	Polyethylene	Yes	No
		Yes (after filter)	8	5	28.8–365.4	1.0–13.4
3	Drinking	Yes (before filter)	7	4	58.6–≥2419.6	11.0–365.4	Galvanized	Polyethylene	Yes	No
		Yes (after filter)	5	2	42.6–866.4	1.0–5.2
4	Drinking	No	8	5	1.0–≥2419.6 *	1.0–980.4	Galvanized	Polyethylene	Yes	No
5	Drinking	Yes (before filter)	8	7	140.8–≥2419.6 *	13.2–1986.3	Tiles	Polyethylene	No	Yes
		Yes (after filter)	7	5	172.3–648.8	2.0–50.4
6	Drinking	No	8	6	5.2–≥2419.6 *	1.0–7.2	Tiles	Polyethylene	Yes	Yes
7	Drinking	Yes (before filter)	8	5	1.0–≥2419.6 *	1.0–≥2419.6 *	Galvanized	Galvanized	No	Yes
		Yes (after filter)	6	3	1.0–≥2419.6 *	1.0–≥2419.6 *
8	Drinking	No	6	3	2.0–≥2419.6 *	1.0–39.3	Galvanized	Concrete	No	No
9	Drinking	Yes (before filter)	8	3	256.5–≥2419.6 *	2.0–22.8	Galvanized	Polyethylene	Yes	No
		Yes (after filter)	2	1	24.3–1553.1	<1.0–1.0
10	Drinking	Yes (before filter)	6	3	32.7–1986.3	13.4–648.8	Galvanized	Polyethylene	Yes	Yes
		Yes (after filter)	3	2	3.0–88.2	1.0–11.0
11	Drinking	Yes (before filter)	6	3	29.9–≥2419.6 *	1.0–24.6	Galvanized	Polyethylene	Yes	Yes
		Yes (after filter)	4	1	8.6–≥2419.6 *	<1.0–2.0
12	Gardening	No	8	6	151.5–≥2419.6 *	3.2–111.2	Tiles	Galvanized	Yes	Yes
13	Gardening	No	8	7	83.6–≥2419.6 *	6.0–648.8	Tiles	Polyethylene	No	Yes
14	Gardening	No	6	3	4.1–1986.3	4.1–38.9	Tiles	Galvanized	Yes	No
15	Gardening	No	6	5	24.6–1203.3	1.0–33.1	Tiles	Galvanized	Yes	No
16	Gardening	No	6	4	18.5–1119.9	1.0–517.2	Tiles	Galvanized	Yes	No
17	Toilets flushing	No	8	2	22.9–307.6	1.0–2.0	Galvanized	Galvanized	No	No
18	Toilets flushing	No	8	8	14.4–259.5	1.0–27.5	Galvanized	Polyethylene	No	No
19	Toilets flushing	No	8	6	179.3–1413.6	2.0–461.1	Tiles	Polyethylene	No	No
20	Toilets flushing	No	8	6	142.1–1299.9	3.1–1203.3	Tiles	Polyethylene	No	No
21	Toilets flushing	No	8	6	165.0–≥2419.6 *	1.0–1986.3	Tiles	Polyethylene	No	No
22	Toilets flushing	No	6	2	17.5–107.6	9.7–14.8	Tiles	Polyethylene	Yes	No
23	Toilets flushing	Yes	8	6	18.9–≥2419.6 *	2.0–435.2	Galvanized	Polyethylene	No	No
24	Toilets flushing	No	5	1	16.4–≥2419.6 *	1.0–107.1	Galvanized	Polyethylene	No	Yes
25	Toilets flushing	No	6	4	119.9–≥2419.6 *	2.0–18.7	Galvanized	Galvanized	No	No
26	Toilets flushing	No	8	8	27.5–≥2419.6 *	1.0–≥2419.6 *	Galvanized	Polyethylene	No	No
27	Firefighting	No	6	1	5.2–1986.3	1.0–325.5	Galvanized	Polyethylene	Yes	No
28	Unused	No	6	6	13.5–1299.7	1.0–58.6	Tiles	Galvanized	Yes	Yes

* Count that exceeded the quantitation limit of 2416.9 MPN/100 mL in the IDEXX Quanti-Tray*/2000 Most Probable Number Table. * Not inclusive of samples that contained < 1.0 MPN, and samples only positive to total coliforms.