The EPA requires that all analytical results showing compliance with the MCLs listed in the SDWA be sent to the State within how many days after the end of the reporting period?

• A. 5 days
• B. 15 days
• C. 10 days
• D. 30 days

Answer: (C)

The key idea is how quickly regulatory data must be reported after monitoring. The SDWA requires that analytical results showing compliance with the MCLs be sent to the State within ten days after the end of the monitoring period. This keeps the State informed in a timely way, supports program oversight, and allows proper record maintenance (such as updating SDWIS). The end of the monitoring period is defined by the sampling schedule (monthly, quarterly, etc.), so the ten-day clock starts after that period ends. Choices that propose a shorter or longer window don’t align with the regulation, whereas ten days provides the mandated balance between timely reporting and administrative practicality.