HomeMy WebLinkAboutMemo - Mail Packet - 4/5/2016 - Memorandum From Keith Elmund Re: Aggregate Compliance Of Area Water Providers With Lead Copper RuleThe testing lab must be certified by the Colorado Department of Health and Environment
(CDPHE) to perform and report those results. Data summaries are also provided in the annual
Consumer Confidence Report (CCR). Separate graphs of current compliance data for the lead
and copper 90
th
percentile action levels for the area water providers are presented below.
The difference in levels of corrosion byproducts shown in the graphs is the result of different
approaches to corrosion control. The City’s Water Treatment Facility uses a combination of
calcium and carbon dioxide to add hardness and buffering capacity to the finished water. The
Soldier Canyon Filter Plant reduces the acidity of the treated water by adding sodium hydroxide.
Both corrosion control methods are acceptable to CDPHE.