The Otay Water District has filed a lawsuit against the city of San Diego challenging the amount the city charges Otay for reclaimed water. The suit, filed May 30 in San Diego Superior Court, claims that there has been a breach of contract by San Diego and excess charges of more than $16 million to Otay since the beginning of 2016. San Diego more than doubled its reclaimed water rate in November 2015, from $350 per acre feet to $753 per acre feet. One acre foot is about 326,000 gallons.