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Calculating or Determining the 90th Percentile during Initial, Followup, Routine, and Reduced Monitoring Calculating the 90th percentile for 5 samples:Rank your samples in order of concentration (mg/L),
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How to fill out lead and copper 90th

01
Gather necessary materials and equipment required for sampling.
02
Identify sampling sites that represent the water supply system.
03
Ensure all taps are properly prepared by not running water for at least six hours before sampling.
04
Collect water samples in clean, pre-labeled containers according to EPA guidelines.
05
Fill out the sampling forms accurately, noting the location and conditions of each sample.
06
Submit samples to a certified laboratory for lead and copper analysis.
07
Record results and ensure compliance with reporting requirements.

Who needs lead and copper 90th?

01
Water utilities responsible for the management of public water systems.
02
Regulatory agencies overseeing water quality standards.
03
Communities and residents concerned about lead and copper exposure in drinking water.
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Lead and copper 90th refers to the 90th percentile level of lead and copper concentration in drinking water samples, as required by the U.S. Environmental Protection Agency (EPA) regulations for water utilities.
Public water systems that exceed the action levels set by the EPA for lead and copper in drinking water are required to file the lead and copper 90th report.
To fill out the lead and copper 90th, water utilities must conduct sampling and testing of drinking water, calculate the 90th percentile of the results, and complete the required reporting forms provided by the EPA.
The purpose of lead and copper 90th is to assess and ensure that drinking water supplied by utilities meets safety standards for lead and copper contamination, protecting public health.
The report must include the number of samples collected, the lead and copper concentrations, the 90th percentile values, and any related actions taken if the action levels are exceeded.
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