Table 1.

Population and As occurrence in 13 study towns, as well as As testing behaviors in the area

Town	Total population^a	Population using domestic wells^b	Percentage of wells exceeding As 10 ug/L^c	Percentage of wells exceeding As 10 ug/L^b	As Testing rate^d	Surveye d HHs in analysis (N)
Belgrade	3189	3087	32%	33%	62.1%	38
Chelsea	2721	2658	18%	3%	61.8%	35
China	4328	4168	25%	14%	65.9%	41
Litchfield	3624	3417	45%	42%	62.4%^e	39
Manchester	2580	1731	48%	62%	52.1%	21
Monmouth	4104	3234	40%	45%	57.5%	41
Mount Vernon	1640	1609	32%	35%	71.4%	21
Readfield	2598	2517	40%	49%	^*82.1%	29
Sidney	4208	4057	29%	30%	68.6%	51
Vassalboro	4340	3277	23%	35%	51.5%	34
West Gardiner	3474	3411	31%	24%	^*30.8%	39
Windsor	2575	2508	14%	10%	^*46.4%^e	25
Winthrop	6092	2772	47%	46%	52.6%	38
Total/Average	45,473	38,446	33%	35%	59.0%	452
Vienna & Wales^f	2186	1994	---	---	58.4%	72

United States Census 2010

Nielsen et al. 2010

Yang 2010

Maine Well Water Testing and Treatment Survey 2013, considered highest likely rate of being ever-tested for As; a consistently large portion of respondents did not remember the results of their test and so may not remember accurately that an As test was in fact performed

An additional 46 and 43 HHs respectively were surveyed in Litchfield and Windsor, confirming As testing rates above within +/− 0.1%

Combined because of small populations, the As rate of these towns is unknown because <20 wells have been tested in the state lab

HH = Household

Significantly different from the population mean across towns, p<0.05.

As testing and occurrence rates not significantly correlated across towns.