City outlines private stormwater maintenance program after inventory finds many out of compliance

City staff told the Lake Stevens City Council that a new program to inspect, prioritize and return private stormwater facilities to maintenance standards is being developed after an inventory found many residential facilities out of compliance and some installations that would be costly to repair.

Taylor Pasture, surface-water team member, presented the draft program and said staff used a weighted scoring system to rank facilities by criteria including homeowner association activity, whether facilities affect structures, maintenance type and estimated cost. "We have 167 residential facilities within the city," Taylor said, reporting that about 33% currently lack an active HOA and that 78 commercial facilities are also inventoried.

Why it matters: Private stormwater facilities—ponds, vaults and detention systems—treat runoff that ultimately affects the city’s streams and Lake Stevens. Deferred maintenance can lead to flooding of public infrastructure and degraded water quality. The program is intended to establish clear outreach, inspection and enforcement steps and to prioritize the facilities that present the most risk.

Key findings and examples: Staff presented the top-priority facilities identified by the scoring system and said roughly 98% of the facilities fell into an estimated maintenance-cost band of $1,000 to $15,000. Taylor and other staff flagged a large underground vault with estimated repair costs in the low hundreds of thousands of dollars — an outlier compared with typical surface-pond fixes. City staff highlighted one specific vault estimate of about $330,000 and noted that, for a neighborhood of roughly 19 homes, the per-home bill on such a repair could exceed $17,000.

Public Works Director Aaron Halverson framed long-term choices for the city: above-ground ponds and low-impact development systems generally cost less to maintain than underground vaults, which can be expensive and harder to access. "When that [a vault] fails, the cost is not $1,300 — the cost is $330,000," Halverson said. "So it's really important... fewer detention vaults and really think about keeping these things above ground."

Education and outreach: Staff said they are deploying signs on facilities, offering webinars and neighborhood workshops (including on-site pond tours and demonstrations) and building a public-facing website and pond registry. The proposed online tool would let residents look up a facility in their neighborhood, see the city’s inspection notes and provide contact information for the property owner or HOA. Staff also showed concept signs with QR codes that would link directly to facility information.

Enforcement approach: The program will rely first on education and technical assistance. For persistent noncompliance or situations that cause flooding or public-safety risk, staff proposed a progressive enforcement policy that could include city-performed maintenance and assessment of costs back to property owners when necessary. Staff said plat language from older subdivisions can be vague and that new plats should include clear maintenance responsibilities and city emergency-access provisions.

Council questions and next steps: Council members pressed staff on who pays for major repairs, whether the city should ever accept ownership of private facilities and how buyers are notified at purchase. Staff said some retention facilities are dedicated to the city but many are the HOA’s responsibility; dedicating all existing private facilities to the city would carry maintenance and budget implications. Staff proposed continuing outreach, finalizing the enforcement policy with legal counsel and returning with an implementation schedule.

Ending: Council praised the education efforts and directed staff to finish the enforcement policy and public-facing registration tools; staff said they will return with a draft enforcement policy and proposed schedule for inspections and remedial actions.