Environmental justice implications of arsenic contamination in California’s San Joaquin Valley: a cross-sectional, cluster-design examining exposure and compliance in community drinking water systems

Table 4 Fisher’s exact tests and related odds ratio (OR) for maximum contaminant level (MCL) violations, 2005–2007, San Joaquin Valley, CA

Variable of interest	≥ 1 MCL violation	No MCL violation	OR (95% CI)	P-value
High % Homeownership	12	269	.33 (.16, .67)	.003
Low % Homeownership	22	161
High % People of Color	24	207	2.6 (1.2, 5.4)	.01
Low % People of Color	10	223

Fisher’s Exact test compares high and low category for variable of interest, where threshold is determined by median value across all CWS, and includes related odds ratio. Test compares demographics in community water systems that received at least one MCL violation to those with zero violations.

ISSN: 1476-069X