Individual Chemicals

<p>The aquifer risk map is being developed to fulfill
requirements of SB-200 and is intended to help prioritize areas where domestic
wells and state small water systems may be accessing groundwater that does not
meet primary drinking water standards (maximum contaminant level or MCL). In
accordance with SB-200, the risk map is to be made available to the public and
is to be updated annually starting January 1, 2021. The Fund Expenditure Plan
states the risk map will be used by Water Boards staff to help prioritize areas
for available SAFER funding..</p><p>Methodology for the draft aquifer risk map <a href='https://gispublic.waterboards.ca.gov/portal/home/item.html?id=6a50a6cd22a144e9ac621e9070e01c44' rel='nofollow ugc' target='_blank'>available for download</a>.<br /></p><p>This layer shows declustered water quality data for arsenic,
nitrate, 1,2,3-trichloropropane, per square mile section that was used to
create the aquifer risk map required by SB-200. The intent of the aquifer risk
map is to help prioritize areas where domestic well users and state small water
systems may be accessing groundwater that does not meet primary drinking water
standards (maximum contaminant level or MCL) and will be updated annually
starting January 1, 2021. </p>

<p>The section water quality data is based on depth-filtered
water quality results from public and domestic supply wells, collected
following a similar methodology as the <a href='https://gispublic.waterboards.ca.gov/portal/home/item.html?id=70feb9f4b00f4b3384a9a0bf89f9f18a' rel='nofollow ugc'>Domestic
Well Needs Assessment White Paper</a>. This layer contains the long-term
average (20 years) as well as the count of recent results (within 2 years)
above the MCL, between 80% - 100% of the MCL, and below 80% of the MCL for each
square mile section. </p>