Notwithstanding the provisions of the constitution or laws of any State limiting the rate or amount of interest that may be charged, taken, received, or reserved, except as provided in paragraph (6), the interest rates on loans (other than guaranteed loans), to public bodies or nonprofit associations (including Indian tribes on Federal and State reservations and other federally recognized Indian tribal groups) for water and waste disposal facilities and essential community facilities shall be set by the Secretary at rates not to exceed the current market yield for outstanding municipal obligations with remaining periods to maturity comparable to the average maturity for such loans, and adjusted to the nearest one-eighth of 1 per centum; and not in excess of 5 per centum per annum for any such loans which are for the upgrading of existing facilities or construction of new facilities as required to meet applicable health or sanitary standards in areas where the median household income of the persons to be served by such facility is below the higher of 80 per centum of the statewide nonmetropolitan median household income or the poverty line established by the Office of Management and Budget, as revised under section 9902(2) of title 42 and in other areas as the Secretary may designate where a significant percentage of the persons to be served by such facilities are of low income, as determined by the Secretary; and not in excess of 7 per centum per annum on loans for such facilities that do not qualify for the 5 per centum per annum interest rate but are located in areas where the median household income of the persons to be served by the facility does not exceed 100 per centum of the statewide nonmetropolitan median household income.

Notwithstanding subparagraph (A), the Secretary shall establish loan rates for health care and related facilities based solely on the income of the area to be served, and such rates shall be otherwise consistent with such subparagraph.

Except as provided in subparagraph (B), the interest rate on any loan made under this subchapter as a guaranteed loan shall be such rate as may be agreed upon by the borrower and the lender, but not in excess of a rate as may be determined by the Secretary.

In the case of a loan made under section 1932 of this title as a guaranteed loan, subparagraph (A) shall apply notwithstanding the provisions of the constitution or laws of any State limiting the rate or amount of interest that may be charged, taken, received, or reserved.

Notwithstanding any other provision of this section, in the case of loans (other than guaranteed loans) made or insured under the authorities of this chapter specified in subparagraph (B) for activities that involve the use of prime farmland as defined in subparagraph (C), the interest rates shall be the interest rates otherwise applicable under this section increased by 2 per centum per annum. Wherever practicable, construction by a State, municipality, or other political subdivision of local government that is supported by loans described in the preceding sentence shall be placed on land that is not prime farmland, in order to preserve the maximum practicable amount of prime farmlands for production of food and fiber. Where other options exist for the siting of such construction and where the governmental authority still desires to carry out such construction on prime farmland, the 2 per centum interest rate increase provided by this clause shall apply, but such increased interest rate shall not apply where such other options do not exist.

For purposes of this paragraph, the term “prime farmland” means prime farmlands and unique farmland as those terms are defined in sections 657.5(a) and (b) of title 7, Code of Federal Regulations (1980).