Menindee locals say they feel abandoned and have no idea how they will recover from a record mass fish kill on the Darling-Baaka River.
NSW Police and water authorities held a second community meeting in the outback NSW town on Friday after millions of fish washed up dead.
Graeme McCrabb went to the meeting and said many voiced concerns about the quality of their drinking water and the future of Menindee after the second major fish kill in four years.
The state's Environmental Protection Agency could not provide water testing results at the meeting.
"Not having any results for the community just added to the layer of frustration," Mr McCrabb told AAP.
"You could hear the anger, the frustration and the disdain. They've just had enough."
A spokesman for the agency said water samples were collected from six sites on the river on Tuesday and delivered to Sydney for testing.
Despite being fast-tracked, some of the tests for pesticides, metals, nutrients, algae and algal toxins would take several days, he said.
The results may be available late next week.
The local council has been carting fresh supplies to residents who rely on the river water.
Mr McCrabb said the clean-up efforts, involving nets and the use of booms, were "beyond a joke" as dead fish were spotted 120km downstream.
"Twenty million dead fish are flowing down the river and we're trying to clean up at the tail end of it."
NSW Greens MP Cate Faehrmann and local independent member Roy Butler have visited Menindee, but locals felt otherwise ignored, Mr McCrabb said.
"Where's our support to try and recover? Abandoned is the only word," he said.
Authorities estimate up to 20 million fish died because of low levels of dissolved oxygen in the water, known as hypoxic blackwater, which was exacerbated by floods and heatwaves.
The kills were worse than other mass deaths in the same region during a severe drought in the summer of 2018/19.
Ms Faehrmann said the state government's lack of response to an enormous ecological crisis was farcical.
"The world's eyes are upon us in terms of how this happened and how we're dealing with it. It's a complete failure by the government," she told reporters in Sydney.
"What we'll be doing in the next parliament is making sure we get an inquiry established into what went wrong with water flows, what water was released and how was it released."
NSW Police Assistant Commissioner Brett Greentree, who is overseeing the emergency operation, said it was unlikely all the fish could be retrieved.
The kill was especially difficult for locals after severe drought and floods.
"They've had a really tough time," he said earlier this week.
