If the budget does not allow for more dairy inspectors to be hired, most of the large dairies in the central valley will not meet federal standards governing the disposal of natural wastes, which can seep into streams and groundwater.
Evidence
If the budget does not allow ~↑DI → ~DMS for more dairy inspectors to be hired, most of the large dairies in the central valley will not meet federal standards governing the disposal of natural wastes, which can seep into streams and groundwater.
The new district budget, ~↑DI however, does not allow for the hiring of more dairy inspectors.
Conclusion
Consequently, most of the DWP district's drinking water is likely to become polluted.
Evaluate
The argument assumes ~DMS → DWP that if most large dairies in the central valley do not meet federal standards, then most of the district’s drinking water is likely to become polluted.