To analyze infrequent compliance with regulation of stormwater discharge, we estimate a random-cost model of the use of silt fence on a single-family lot under construction in an urbanizing county of the Southeast. The probability of silt-fence use increases if the original developer still owns the lot, a home owners association exists in the subdivision, or the neighborhood has a multi-family dwelling. The probability decreases as the mean cost of the lots and houses being built increase, heated floor space decreases, or the share of lots under construction decreases. These results can help county officials to target inspection where non-compliance is likely and modify regulations to improve compliance
