Septic systems in Harrah, OK

Harrah, east of OKC along the North Canadian River, includes many rural lots. At least one DEQ-certified installer lists a Harrah address on the DEQ list of active certified installers.

Local facts for Harrah

Lots platted before Jan 1, 1974 are exempt from DEQ minimum lot sizes, but new systems on them must still meet current construction rules (252:641-1-3, DEQ rules, OAC 252:641).
System size is based on 200 gallons/day for up to 2 bedrooms plus 66 gallons/day per extra bedroom (same rule).

Tip: On older Harrah acreage, ask DEQ for the existing system records before an inspection; some companies include this records search in an inspection.

State rules

DEQ rules apply across Oklahoma County: inspection before backfill, certified installers, and the 2-year aerobic maintenance rule (rules, aerobic guide). Local contact: City of Harrah.

Costs

See the sourced cost table and what each service involves.

Local facts checked Oct 23, 2026.

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