The National Environment Management has banned sand harvesting along Narok-Mai Mahiu road.
This followed the situation where the road has been cut off by floodwaters.
Through a statement, the environment regulator said the ban will be effected immediately.
"The ban includes but is not limited to the stretch from Mai-Mahiu to Narok, being a 10-kilometre radius on either side of the road."
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The agency says it has deployed inspectors and law enforcement to ensure the notice is complied with.
The authority will review its position once it has carried out a comprehensive strategic environmental assessment on sand harvesting.
Mai-Mahiu hit the headlines following a fault line that developed in Naivasha during the ongoing heavy rains.
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