Sunny Slope Water Company is a mutual water company in Pasadena, California that provides water to a population of more than 25,000 in parts of Arcadia, San Gabriel, San Marino, Temple City, and unincorporated Los Angeles County. The water company discovered TCP contaminants at dangerous levels in two of its drinking water wells, which left the wells inoperable and forced Sunny Slope to rely on other wells to offset reduced production.
Sunny Slope faced two signification challenges: finding water sources to meet the demands of the growing population in the mostly residential service area, and finding the funds to treat the contaminated wells. They first explored upgrading a pipe, and then looked into installing a filtration system to remove the contaminants. The filtration system was deemed the best path forward, but had a $2 million dollar price tag. The water company secured a grant that covered less than half the cost of installing the system, but that left the second half of installation and the millions more required to maintain and operate it over the decades the TCP was expected to remain in the wells.