What are the THM levels in the water the district provides?
You can view the water district’s most recent lab data. First choose the monthly lab report you wish to view. THM levels are reported as “total trihalomethanes” in (mg/L) and are found in the second data grouping under Primary Standards – Mandatory Health-Related Standards. Since 1993, levels of THM measured in treated water range from .040-.100 mg/L. During the drought years of 1987-1992, levels tended to be higher (.080-.100 mg/L). This is because the drought condition increased levels of salt water intrusion and agricultural runoff in the source water from the Sacramento-San Joaquin Delta.
