The phrase "requirement to maintain" is correct and usable in written English.
You can use it to refer to a need to keep something in a certain state or condition. For example, "The organization has a requirement to maintain a high-quality standard of customer service."
Aerobic-composting (using microbial consortium culture), like vermi-composting, proved to be an effective technology with advantage of no requirement to maintain ambient living conditions in lean periods as is required for earthworms in vermi-composting, but needs more energy/labor for biomass turnings.
Is there a requirement to maintain a certain level of fitness between Opens?
When the board's financial control period ends in 2008, the requirement to maintain those standards also ceases.
There's no legal requirement to maintain your employee pay scales that are disrupted by the living wage.
Must I make my 19th century town house accessible, and wouldn't this conflict with the landmark requirement to maintain the historic exterior?... Nathaniel Frank, Brooklyn.
But they warn that its application is being hampered by the military requirement to maintain the secrecy of raw, precise, positional information.
Water companies such as Severn Trent and Pennon also perform a critical social role: the requirement to maintain supply to those in relative poverty is built into regulated returns.
To meet the liquidity requirement to maintain inclusion in the FTSE-100, the company must make a share placement in 2013, raising cash but also creating an overhang risk that may cap near-term share price performance.
Ever since the law was enacted in 2010, governors of both parties have complained about its requirement to maintain Medicaid eligibility levels, saying it has hamstrung their efforts to balance budgets during a period of excruciating economic pressures.
It states that the mortgage servicer "shall not obtain force-placed hazard insurance unless there is a reasonable basis to believe the borrower has failed to comply with the loan contract's requirement to maintain property insurance".
"We absolutely want to ensure that the forces we're working with understand and appreciate their requirement to maintain appropriate human rights," Admiral McRaven told Congress in March, the first of several public comments he has made on the law's impact in recent months.
