California’s drought means that local waters are carrying more toxins than years prior, according to an ongoing analysis by Coastkeeeper.

Based on Coaskeeper’s analysis, released Tuesday, The San Luis Rey Watershed had the best water quality, followed by the San Dieguito Watershed. Nearly 200 trained volunteers collect and analyze water samples based on their chemistry, nutrients, bacteria and toxicity. Those results are compiled and analyzed, and then each watershed is given a ranking: a score of 100 means that every sample was within an acceptable range for each measurement.