Understanding iron ochre deposits
Have you noticed orange or reddish gelatinous deposits in a foundation drain, catch basin or near a pump? These deposits may be iron ochre. Their accumulation can affect drainage and contribute to basement moisture problems.
Lab’Eau-Air-Sol examines samples of suspected deposits to look for iron bacteria.
How iron ochre forms
Iron ochre is an orange, reddish or brownish deposit containing iron compounds. It forms when iron in soil and groundwater reacts under favourable conditions. Deposits can become viscous or gelatinous and accumulate in foundation drains, catch basins and around pumps.
Formation may involve chemical oxidation of dissolved iron, the activity of naturally occurring iron bacteria, or both. Bacterial activity can accelerate the formation and accumulation of deposits.
Effects on drainage
Significant deposits can reduce water flow and contribute to blocked drains. The resulting infiltration and excess moisture can create conditions favourable to mould growth. Iron ochre itself is not considered a health hazard; attention is primarily needed for its possible effects on drainage and building moisture.
What the analysis involves
The laboratory examines sludge or deposits collected from foundation drains and catch basins to look for iron bacteria associated with biological iron ochre formation.
Testing a deposit documents the presence of iron bacteria. It cannot, on its own, predict future accumulation or drain blockage. A fuller assessment may require a qualified professional to examine the soil, groundwater and drainage conditions.
When to request an analysis
- You notice orange or reddish sludge in a catch basin or foundation drain.
- Deposits repeatedly accumulate around a pump or sump.
- You suspect iron ochre and want to check for iron bacteria.
- You need information about the testing process or cost.
Preparing your sample
Consult our sampling instructions for the required quantity, storage conditions and shipping arrangements.