Leaking underground fuel tanks, industrial spills, storm runoff, septic systems, inefficient agricultural operations, and other sources can pollute groundwater, making it costly to treat or even unusable. Since the restoration of contaminated groundwater can take years, decades, or longer, preventing contamination is critical. The district works hard to protect the groundwater basins from contamination and the threat of contamination.
By monitoring water quality at wells throughout the county, the district can assess regional groundwater quality and identify and evaluate threats. The district also oversees well construction and destruction, since improperly constructed or destroyed wells can allow contaminants to reach water supply aquifers. Other district efforts to prevent or mitigate contamination include technical studies, coordination with land use and regulatory agencies, and efforts to increase public awareness of the importance of protecting groundwater resources.
Groundwater quality in Santa Clara County is generally very good. Public water supply wells throughout the county deliver high quality water to consumers, almost always without the need for treatment. Cleanup is ongoing at a number of contamination sites and elevated concentrations of nitrate and perchlorate have been observed in some areas. The district is working with other agencies and the public to manage these issues and ensure groundwater quality remains high throughout the county.
The district, local cities, and water companies regularly test their well water - private well owners should do the same. Your well water may taste and look fine, but it might have contaminants that you can't detect. To protect your health, the district urges you to have your well water tested annually by a certified laboratory, or more frequently if you notice a change in color, odor, or taste.