Lake County, Clearlake officials outline filtration installs and testing plan after Robin Lane spill

Lake County and City of Clearlake officials onlined a multi-part response on an ongoing groundwater contamination incident originating on Robin Lane, promising targeted testing, temporary tanks and a program to install whole-house filtration systems for impacted residences.

Angie Dodd, the hydrologist contracted to analyze the incident, told residents she has mapped a surface spill and traced a bacterial plume through the Burns Valley Groundwater Basin. "I'm generally seeing things decrease, and the plume slowing down," Dodd said, while cautioning that limited baseline data for this shallow aquifer makes definitive conclusions difficult without continued sampling.

The county and city described a short- to medium-term approach: continue daily bacteriological sampling to track the plume, expand targeted chemical testing via outside laboratories, and offer an NSF 55 Class A UV-certified whole-house filtration and sanitization system (sediment and carbon prefilters plus UV reactor) to properties in affected zones. Alan Flora, city manager, said officials have identified 100 systems immediately available from a Canadian supplier and estimate a need of roughly 150 units; the additional 50 are expected in the following weeks but delivery timing could be affected by customs and contractor availability.

Officials emphasized that installations require homeowners to sign a right-of-entry form allowing contractors to work on private property. The county will cover the cost of the systems, Flora said, but routine maintenance (changing filters, monitoring alarms) is the homeowner’s responsibility. Staff said they are recruiting local licensed contractors to do installations and will post FAQs and scheduling information on the response website and in printed flyers.

Residents pressed officials on testing consistency and field procedures. Several reported that samples had been taken from different points (for example, a spigot versus a well tap) and with varying pump-run times. Environmental health staff acknowledged equipment differences across wellhouses but defended the validity of results when lab protocols are followed, stating, "just because they pulled from a different tap does not make the test invalid." Staff reiterated the sampling steps used in the field: disinfect the sampling bib (two-minute contact time), run the pump for about five minutes to clear lines, then collect the sample.

The response team provided the following operational and technical clarifications: many domestic wells in the Burns Valley area are shallow (examples cited ranged from about 34 feet to 140 feet, with an average near 74 feet and alluvium typically less than 100 feet thick), which increases vulnerability to surface contamination; bacteriological results typically take about two days to return from the local lab, while more complex chemical tests are sent to out-of-county contract labs and take longer; and field teams have added ammonia, nitrate and nitrite tests at the hydrologist’s request to support plume analysis.

Temporary water support remains in place: the county reported about 33 tanks deployed to addresses that requested them (25 by asset teams and 8 by social services) and said more tanks are being ordered and prioritized based on testing results and vulnerability. Staff also said interim services such as showers and laundry will continue while demand warrants them.

Officials asked residents who have not received test results or who lack correct contact information to call city staff so records can be updated. Social services staff and on-site assistance will help residents who need support with online applications, and the county will publish priority-criteria guidance on the website for households requesting installations.

The response team closed by reiterating that the filtration-install program and testing plan are tentative and subject to change as new results arrive and supplies move through customs; the county said it will continue daily updates on the response website and follow up individually with residents about installations and remediation steps.

The most recent procedural step officials named was posting the applications and FAQs online and scheduling installations as contractor capacity becomes available; there was no vote or formal policy decision taken at this meeting.