Water Quality Parameter (WQP) Monitoring and Reporting Requirements (Part I)
What is the purpose of collecting (WQP) samples? To determine the corrosiveness 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 (when an 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.
Entry Point Samples: You must take two samples from each active 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, please refer to the following table:
System Size
> 100,000
10,001 to 100,000
3,301 to 10,000
501 to 3,300
≤ 500
Number of Sites
25
10
3
2
1
Number of Samples
50
20
6
4
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 (Part II)
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.
What are some source water treatment methods? Ion exchange, reverse osmosis, lime softening and coagulation/filtration.
Optimal Corrosion Control Treatment Recommendation (Part III)
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
lead and copper tap water results, WQP results and source water lead and copper levels.
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.