Overview
2018 zoning reform consolidated three legacy SF districts (R-1, R-2, R-3) into single Neighborhood Residential (NR) district permitting up to 4 units per lot by-right with no minimum lot size — five years before WA HB 1110 mandated similar middle-housing standards statewide. Short stack of commercial/MU/industrial districts plus special Airport Development District (ADD).
- Early Reformer (2018): Walla Walla eliminated single-family-only zoning in 2018, five years before WA HB 1110. Cited by APA and The Urbanist as a national model.
- No Minimum Lot Size in NR: unprecedented in WA at adoption; allows maximum housing density without affordability conditioning.
- 5-foot side yard in NR: narrow for fire/utility access; potential conflicts with traditional building codes.
+ 6 more in Quirks & notes
Districts
| Code | Name | Category | Min lot | Height | Coverage | FAR | Du/ac | Parking | Setbacks F/S/R |
|---|---|---|---|---|---|---|---|---|---|
| NR | Neighborhood Residential | res_mf | —[4] | 35 ft[5] | 0.5[6] | — | —[7] | — | 20[1] / 5[2] / 20[3] |
| CC | Central Commercial | cbd | — | -1 ft[11] | 1[12] | — | — | — | 0[8] / 0[9] / 0[10] |
| ADD | Airport Development District | spec | — | — | — | — | — | — | — / — / — |
Confidence: confirmed partial under review not found
Overlays
Mapped critical areas per WA Critical Areas Act RCW 36.70A.060: wetlands, fish/wildlife habitat conservation areas, frequently-flooded areas, geologic hazard areas, aquifer recharge areas. Walla Walla qualifies via Mill Creek, Yellowhawk Creek, Garrison Creek (frequently-flooded + habitat) and Blue Mountain foothills (geologic).
| buffer_widths | not retrieved |
|---|---|
| mitigation | not retrieved |
| density_transfer | not retrieved |
FEMA Special Flood Hazard Areas along Mill Creek, Yellowhawk Creek, Garrison Creek per Walla Walla County FIRM panels. NFIP participation required.
| bfe_freeboard_ft | typically +1 ft above BFE in WA (verify) |
|---|---|
| fill_restrictions | per NFIP |
| v_zone | not_applicable (inland) |
WA Shoreline Management Act RCW 90.58 attaches to 'shorelines of the state' — streams ≥20 cfs mean annual flow, lakes ≥20 ac, marine waters. Mill Creek through Walla Walla generally below 20 cfs at base flow — SMP jurisdiction may not attach city-wide; needs Mill Creek mean-annual-flow verification.
| shoreline_environment_designations | not retrieved |
|---|---|
| public_access | per RCW 90.58 |
| no_net_loss | per RCW 90.58 |
14 CFR Part 77 imaginary surfaces extend over portions of city from ALW. WA RCW 14.12 authorizes airport overlay zones. Walla Walla uses the ADD base district as the on-airport regulatory mechanism; a separate AICUZ-style off-airport overlay was not located this pass.
| part_77_surfaces | federal (FAA) |
|---|---|
| compatibility_uses | per RCW 14.12 if adopted |
Walla Walla has multiple NRHP-listed properties and a recognized historic downtown (Main Street District); a binding zoning HP overlay with demolition-review trigger was not identified in this pass. May be administered through a separate ordinance or via the Downtown Walla Walla Foundation Main Street program rather than as a Title 20 overlay.
Not applicable — Walla Walla has no major transit (no light rail, no BRT, no ferry). Valley Transit operates local fixed-route only. HB 1491 does not apply.
Effectively merged into the CC (Central Commercial) base district with 0-setback, 100% coverage, no height max. No separate downtown overlay layered on top.
| setback_ft | 0 |
|---|---|
| lot_coverage_pct | 100 |
| max_height_ft | -1 |
Not applicable — no military installation within or adjacent to Walla Walla city limits.
Not applicable — inland city; no coastal zone.
No locally-adopted AH density-bonus or inclusionary overlay identified in this pass.
WA RCW broadly authorizes PUDs; city likely has a planned-development chapter in Title 20. Specific mechanism not retrieved this pass.
State preemptions
Non-applicable laws (1)
Adopted building codes
Statewide; update sched May 2026
Click a code label to open its state-by-state adoption atlas.
Quirks & notes
- Early Reformer (2018): Walla Walla eliminated single-family-only zoning in 2018, five years before WA HB 1110. Cited by APA and The Urbanist as a national model.
- No Minimum Lot Size in NR: unprecedented in WA at adoption; allows maximum housing density without affordability conditioning.
- 5-foot side yard in NR: narrow for fire/utility access; potential conflicts with traditional building codes.
- Zero-lot-line attached housing encouraged in NR; end units must maintain 5 ft side yard.
- No transit-based density bonuses (differs from Marysville model); no major transit infrastructure to anchor TOD.
- County vs. city jurisdiction: Walla Walla County (Title 17) separate from city (Title 20).
- GMA status edge case: Walla Walla County is in the partial-planning category under RCW 36.70A.040; city's formal GMA-planning status (voluntary opt-in vs. required) needs WA Department of Commerce roster confirmation. Affects formal applicability of HB 1110, HB 1220, SB 5184, HB 1181 but does not change the city's substantive over-compliance posture.
- Mill Creek runs through downtown in a USACE flood-control channel (1948 project) — affects floodplain mapping and SMP jurisdiction analysis.
- Walla Walla AVA wine industry creates active land-use pressure for tasting-room and winery uses in CC, ADD, and surrounding districts.
Formulas
Definitions
- max_height_ft
- Maximum building height measured from grade; rooftop equipment exclusions per §20.102 (verify).
- setback_*_ft
- Measured from property line to building face; corner lot, through lot, accessory structure exceptions per §20.102; end units of attached housing must maintain 5 ft side yard.
- lot_coverage
- Building footprint as percentage of lot area; verify whether accessory structures and impervious surfaces count.
- parking_ratio
- Per-unit basis; verify against §20.104 parking schedule.
- du_ac
- NR has no DU/AC cap because it has no minimum lot size; density regulated by built-form (height, coverage, setbacks).
Capacity calculations
- nr_max_units_by_lot
min(4, lot_area_sf / built_form_envelope) — NR permits up to 4 units per lot by-right; built-form envelope governed by 35 ft height × 50% coverage × setbacks 20/5/20- cc_envelope
lot_area_sf × 1.0 coverage × stories (no height max) — central commercial unconstrained by height/coverage in code
Massing explorer
Interactive 3D comparison across every district. Drag to orbit, scroll to zoom, use the slider to walk districts, and toggle applicable overlays in the right-side panel.
| District | Category | Height | FAR | Coverage | Setbacks | Parking | Density | Min lot | Overlays |
|---|
Sources & references
codepublishing.com is the canonical city convenience copy; Cloudflare 403 for scripted GETs — Chrome MCP required for full retrieval per `_references/source-portals.md`. eCode360 chapter mirror retained as secondary.
- [1] §20.102
- [2] §20.102
- [3] §20.102
- [4] §20.102
- [5] §20.102
- [6] §20.102
- [7] i
- [8] §20.102
- [9] §20.102
- [10] §20.102
- [11] §20.102
- [12] §20.102
Research status
Publication gates
| primary url present | passed | code_source = https://www.codepublishing.com/WA/WallaWalla/ — non-aggregator city-hosted convenience copy; v1 had empty code_source string. |
|---|---|---|
| no aggregator cited | passed | No Zoneomics/Steadily/SitePlanGuide/Propwire anywhere; APA and The Urbanist cited as context only, not primary. |
| confidence tags full form | passed | All confirmed claims carry §-form citations (c§20.50, c§20.100, c§20.102 plus RCW references); explicit status enums (partial/not_found/not_applicable/under_review) where applicable; no bare [confirmed] tags. |
| overlays have parameters trigger confidence | passed | 11 overlay slots evaluated against the 9-category overlay-types reference; each carries status + geographic_trigger + parameters/citation OR explicit not_found/not_applicable with search_performed; v1 had blanket 'None specifically identified [inferred]' Gate 4 failure. |
| preempt section city specific | passed | 6-entry state_preemptions_applicable array with Walla Walla-specific qualifying conditions (Tier 2 population threshold, GMA-planning conditional flagged under_review, no-major-transit determination); explicit does_not_apply for HB 1491; v1 had a 2-entry summary stub without qualifying conditions. |
Data quality
- WWMC §20.104 parking schedule
- Critical-areas chapter location and buffer widths
- PUD chapter location and mechanism
- Mill Creek mean-annual-flow for SMP jurisdiction determination
- Walla Walla City formal GMA-planning status (Department of Commerce roster)
- Off-airport AICUZ-style overlay (separate from ADD base district)
- Standalone historic preservation ordinance outside Title 20
- Additional base districts (GC, MU, LI/GI) standards
Known issues
Other cities in this state
Nearest-alphabetical profiles. Click through to compare zoning patterns side-by-side.