Quick Reference Guide for Monitoring Requirements Following an Exceedance
Water Quality Parameter(WQP) Monitoring and Reporting Requirements
What is the purpose of collecting (WQP) samples?To determine the corrosivity of your water.
What are WQP samples analyzed for?Samples are analyzed for pH, calcium, alkalinity, conductivity, temperature, orthophosphate (when an inhibitor containing phosphate is used) and Silica (whenan inhibitor containing silica is used).
Where are WQP samples taken?Samples are taken at representative taps throughout the distribution system and the entry point(s) to the distribution system.
How do I choose sample locations?
Distribution System: You must identify sampling sites representative of the water quality throughout the distribution system. This can include your coliform or lead and copper sample sites.These samples are taken in addition to the entry point samples.
Entry Point Samples: You must take twosamples from eachactive entry point to the distribution system.
How many WQP samples do I need to take in the distribution system?The number of required sample sites based on your system size. For each required sample site your system must take two samples. To determine the number of sites and samples necessary, please refer to the following table:
System Size / Number of Sites / Number of Samples> 100,000 / 25 / 50
10,001 to 100,000 / 10 / 20
3,301 to 10,000 / 3 / 6
501 to 3,300 / 2 / 4
≤ 500 / 1 / 2
How often do I need to take WQP samples?Samples must be taken once per 6-month monitoring period. You will continue to conduct WQP monitoring as long as you are on standard 6-month monitoring.
Where do I submit my WQP samples for analysis?You may use any DEQ certified laboratory.
What are the reporting requirements?Results must be submitted within ten (10) days of the end of the monitoring period using the Water Quality Parameter Report form.
Source Water Monitoring and Reporting Requirements
What is the purpose of collecting source water samples?To determine the contribution from source water to tap water lead and copper levels, to assist you and the States in designing an overall treatment plan for reducing lead and copper levels and to assist the State in determining whether source water treatment is necessary to reduce lead and copper levels.
What are source water samples analyzed for?Samples are analyzed for both lead and copper.
Where do I collect source water samples?Samples are collected at each entry point to the distribution.
When do I collect source water samples?Samples must be collected no later than 180 days after the end of the monitoring period during which the lead and/or copper action level was exceeded.
What are the source water reporting requirements?You are required to submit a source water treatment recommendation to the State no later than 180 days after the end of the monitoring period during which you exceeded the lead or copper action level using the Source Water and Optimal Corrosion Control Treatment Recommendation form.
What information do I evaluate to make a source water treatment recommendation?You evaluate your source water monitoring results and compare them to lead and copper distribution results in that same monitoring period.
What are some source water treatment methods?Ion exchange, reverse osmosis, and coagulation/filtration.
Optimal Corrosion Control Treatment Recommendation
What is an optimal corrosion control treatment recommendation? A recommended treatment believed to result in optimal corrosion control.
What information do I evaluate to make an optimal corrosion control treatment recommendation?You evaluate your WQP results, lead and copper tap water results, and source water results.
What are the optimal corrosion control treatment recommendation requirements?You are required to submit an optimal corrosion control treatment recommendation to the State no later than 180 days after the end of the monitoring period during which you exceeded the lead or copper action level using the Source Water and Optimal Corrosion Control Treatment Recommendation form.
What are some corrosion control methods?Alkalinity and pH adjustment, calcium hardness treatment and the addition of a corrosion inhibitor.
Page | 1