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County flags Terrace Heights water limits; Zone 4 development could require $8'10M
Summary
County staff said Terrace Heights Zones 1'3 can absorb roughly 130 additional ERUs, but Zone 4 lacks wells and distribution and would need an estimated $8'10 million to serve future subdivisions; officials identified $2 million of intermediate upgrades and recommended pursuing state and federal grants and the CHIP program.
Yakima County engineers and utilities staff told commissioners that the Terrace Heights water system is divided into four pressure zones and that available capacity is driven by wells, storage, pump capacity, pipe sizes and fire-flow requirements. Public Services Director David Haws and Utilities Manager Sanjay Barik said Zones 1'3 could accommodate roughly 130 additional equivalent residential units (ERUs), allocated on a first-come, first-served basis, while Zone 4 currently lacks the infrastructure to provide service.
Staff outlined options and costs for expanding capacity. They said approximately $2 million in targeted upgrades including storage-tank rehabilitation, distribution-line upgrades and a SCADA system could significantly increase efficiency and capacity in Zones 1'3. By contrast, developing Zone 4 to serve planned subdivisions would require an estimated $8'10 million to build new wells, pumps, storage and distribution. County officials discussed pursuing state and federal grants, utility funding, legislative appropriations and Washingtons Connecting Housing to Infrastructure Program (CHIP) to close funding gaps and support responsible growth.
