((a)) ** Price adequate to recover charges** The price of irrigation water delivered by the Secretary pursuant to a contract or an amendment to a contract with a district, as specified in , shall be at least sufficient to recover all operation and maintenance charges which the district is obligated to pay to the United States.section 390cc of this title

((b)) ** Modification of price** Whenever a district enters into a contract or requests that its contract be amended as specified in , and each year thereafter, the Secretary shall calculate such operation and maintenance charges and shall modify the price of irrigation water delivered under the contract as necessary to reflect any changes in such costs by amending the district’s contract accordingly.section 390cc of this title

((c)) ** Districts not operating from Federal funds** This section shall not apply to districts which operate and maintain project facilities and finance the operation and maintenance thereof from non-Federal funds.