Five permit violations cloud an already-impaired Richardson Bay
August 6, 2026
Richardson Bay carries a state impaired-waters listing and a cleanup plan meant to draw down pollutants that have accumulated here for years. Against that backdrop, the current compliance picture among the watershed's permitted dischargers is worth noting. Of ten permitted facilities, including Marin County's Sanitation District No. 5 wastewater plant sited almost exactly at the bay's center, the Sausalito-Marin treatment plant, the Paradise Cove treatment plant, and several marine service yards, five currently have active permit violations and six have logged at least one violation in the past year.None of these violations has risen to significant non-compliance, and no penalties have been levied. This isn't a dramatic spill or an enforcement crackdown; it's quieter and more persistent than that. A bay already flagged for cleanup is taking in discharge from treatment plants that aren't consistently holding to their own permit limits, month after month, without any single incident large enough to trigger a stronger response. Paradise Cove Beach, within this same bay system, carries its own separate impairment listing, which underscores how compounded the pressure on this shoreline already is.Freshwater gauges on Redwood Creek near Muir Beach and Corte Madera Creek at Ross are currently reporting only streamflow and gage height, not temperature or dissolved oxygen, and in any case neither gauge sits on Richardson Bay itself, so neither speaks to conditions in the bay proper. That gap in direct monitoring matters most in late summer. Warm, still water holds less dissolved oxygen to begin with, and nutrient loading from wastewater discharge raises the risk of algal blooms just as the bay's tidal flushing is often at its weakest.Watershed Alliance of Marin and Mill Valley Streamkeepers both track conditions in this watershed and are worth watching for any direct readings taken from the bay itself in the weeks ahead.
Bay water temperatures hit 20°C this week, a threshold where petroleum…
June 29, 2026
Bay water temperatures hit 20°C this week, a threshold where petroleum compounds become significantly more toxic and dissolved oxygen drops sharply. The timing is sobering: the refinery upstream fell into permit violation just as seasonal warming arrived, doubling the chemical stress on water already listed by the EPA as impaired.The bay has shown real recovery over the past decade — native fish and invertebrates have returned, water clarity has improved. But that recovery and active industrial discharge are now occupying the same system. Warmer water means faster chemical reactions and less oxygen for organisms that evolved in cooler, cleaner conditions. The margin between restoration and fresh damage has never been thinner.
Tiburon mariposa lily opens in summer light
June 6, 2026
The summer air carries the scent of dry grass and salt from the bay. Here on the slopes above Tiburon, the longest days of the year have arrived, and with them, something rare unfolds in the coastal scrub. Step outside if you can, or find a window that opens to summer light. The heat builds slowly in the morning, and by noon, the hillsides shimmer.In this narrow band of serpentine soil, the Tiburon mariposa lily opens its three-petaled flowers to the June sun. Each bloom spans three inches across, white petals marked with purple chevrons at the base, surrounding a cluster of yellow anthers. The lily grows from a bulb buried six inches deep in the rocky soil, sending up a single stem that can reach two feet tall. This threatened wildflower exists nowhere else on earth except these serpentine slopes in Marin County. The plant spends eleven months of the year as an underground bulb, emerging only when the soil warms and the rains have stopped.The mariposa lily shares this harsh ground with other rarities. Long-rayed brodiaea, also threatened, clusters its purple flowers on nearby slopes. Marin dwarf-flax, another endemic, opens tiny white flowers among the rocks. These native plants have adapted to serpentine soil, which contains high levels of magnesium and heavy metals that most plants cannot tolerate. The invasive pale flax and common cat's-ear struggle here, giving the natives an advantage in their own territory. The rocky, nutrient-poor soil that challenges most plants becomes a refuge for species that evolved with it. Each lily plant may live for decades, blooming only when conditions align perfectly. The bulbs can remain dormant through drought years, waiting for the right combination of winter rain and summer heat.Bees and butterflies find the mariposa lilies during their brief flowering window. The flowers produce nectar deep in their cups, accessible to long-tongued pollinators. Each successful pollination produces a three-chambered seed capsule that splits open in late summer, releasing seeds that may take seven years to produce their first flower. Most seeds never germinate. Those that do must navigate the narrow window between too much moisture and too little, between the spring rains and the summer drought. The population here numbers in the hundreds, each plant a survivor of this precise timing.Close your eyes and feel the summer heat building on your skin. Somewhere on these slopes, white petals catch the light, opening wider as the temperature climbs. The air shimmers above the serpentine, and the scent of warming earth rises from the ground.
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