SANTOS has again attracted the attention of NSW environment watchdog, the Environment Protection Agency (EPA).
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Its latest spill came just hours after signing the historic Principles of Land Access agreement with AGL.
The EPA is scrutinising a spill of 500 litres of coal seam gas (CSG) wastewater into the Pilliga.
News of the incident emerged about 4pm on Friday last week.
Wastewater was spilt when it was transported from a test well to storage pond 2 at Santos' Bibblewindi site, located within the forest, on Tuesday, March 25.
A spill occurred when transferring water into a diversion drain, which Santos said had been blocked to prevent the produced water leaving the site.
A Santos spokeswoman said the spill was captured in a diversion drain and returned to the holding pond.
The spill amounted to about two bathtubs of water and did not pose a risk to "any nearby water source and no risk to the environment", the spokeswoman said.
Greens MLC Jeremy Buckingham said Santos' good news "didn't last until dinner".
"They promised their new management regime would ensure pollution would stop. This incident proves this industry is unsafe no matter who runs it," Mr Buckingham said.
In February, Santos was fined $1500 when the EPA revealed leaked wastewater from Bibblewindi storage pond 3 carried heavy metals, including lead and arsenic into groundwater.
Uranium was detected at 335 micrograms a litre - about 20 times the Australian drinking water guideline for health of 17 micrograms/L.
Forbes Shire Council was recently fined $165,000 for pumping water from an overflowing effluent dam at the Central West Livestock Exchange, onto an irrigation area in June 2013.
Namoi Cotton was hit with heavy fines for allowing cotton trash to enter the Namoi River in August last year.
It stacked trash on land without a licence.
Namoi Cotton entered an agreement to pay $44,000 for the EPA's costs and $100,000 environmental works.
EPA's then acting environmental regulator, Giselle Howard said "there was no actual environmental harm", but the cotton could have potentially impacted peoples' health or the environment.