Lead and Copper Rule
The Lead and Copper Rule protects public health by minimizing lead and copper levels in drinking water, primarily by reducing corrosion of plumbing materials. This rule applies to all community water systems, including the City of Plano.
Sampling is accomplished through a partnership with homeowners and residents. One hundred
(100) sites in the City of Plano are approved by the Texas Commission on Environmental Quality (TCEQ) for monitoring. Fifty (50) sites are selected annually and homeowners submit samples between June 1 and September 30. City of Plano staff collect samples and deliver them to a lab accredited by the State of Texas under the National Environmental Laboratory Accreditation Program.
The data on this site is updated annually once lead and copper sampling is completed and results are available.
Lead Action Level
The lead action level is 0.015 milligrams per liter (mg/L). The action level is exceeded if the "90th percentile" lead level exceeds 0.015 mg/L in any monitoring period. The 90th percentile lead level is exceeded when more than 10% of tap water samples have a concentration over the action level.
The chart displays the lead concentrations at sites sampled for the selected year. Sites with no value indicate lead concentrations were below the detectable reporting value of 0.0005 mg/L. Only 50 of the TCEQ approved 100 sites are sampled each year. Sample IDs stay the same, but locations change depending on homeowner availability.
Copper Action Level
The copper action level is 1.3 mg/L. The action level is exceeded if the concentration of copper in more than 10% of tap water samples collected during any monitoring period is greater than 1.3 mg/L.
The chart displays the copper concentrations at sites sampled for the selected year. Only 50 of the TCEQ approved 100 sites are sampled each year. Sample IDs stay the same, but locations change depending on homeowner availability.