; and (ii) an understanding of the relevant plumbing systems and environmental factors that will impact point-of-use or point-of-entry water safety; and (D) to coordinate or facilitate the approved installation by a qualified third-party installer of the eligible drinking water quality improvement product selected by an eligible end user. (d) Grant limitations (1) Amount The amount of a grant under this section shall not exceed the reasonable costs, as determined by the Secretary, of the purposes described in subsection (c) for which the grant is provided. (2) Income No grant provided under this section shall be used to assist an eligible end user who is a member of a household the members of which have a combined income, or an eligible end user with business income, for the most recent 12-month period for which the information is available, that is more than 150 percent of the median nonmetropolitan household income for the State or territory in which the eligible end user resides, according to the most recent decennial census of the United States. (e) Grant administrator The Secretary shall appoint an officer or employee of the Department of Agriculture to administer and manage grants provided under this section. (f) Grant allocation In providing grants under this section to eligible grant recipients, the Secretary shall allocate funds and make grants available in a manner that— (1) responds to a range of water quality challenges; (2) prioritizes funding to eligible end-users the sources of drinking water of which are private wells; (3) improves local and regional capacity to respond to contamination; and (4) ensures reasonable access to funds for— (A) eligible end users seeking a grant under this section