Landlords person been urged by a watchdog to "act now" aft tens of thousands of properties were recovered to person "notable" damp and mould.
It comes aft the decease of toddler Awaab Ishak, who was exposed to mould successful his location successful Rochdale successful 2020.
The Regulator of Social Housing (RSH) recovered betwixt 120,000 and 160,000 of societal homes successful England were estimated to person "notable" issues.
About 40,000 to 80,000 were thought to person superior issues.
A coroner ruled two-year-old Awaab died from a respiratory information caused by vulnerability to superior mould successful his flat.
The toddler's begetter had repeatedly raised the contented with Rochdale Boroughwide Housing but nary enactment was taken.
The RSH aboriginal recovered "widespread failings" astatine the lodging relation that owned the level Awaab had lived in.
Following a coroner's study past year, the RSH asked providers of societal lodging to taxable grounds astir the grade of damp and mould successful tenants' homes and their attack to tackling it - and the latest figures emerged.
The regulator estimated that little than 0.2% of societal homes, astir 8,000 homes, successful England person the astir superior damp and mould problems.
These would neglect the Decent Homes Standard, the regulator said.
It added that much specified cases were reported among section authorities than backstage providers.
The regulator said: "These are not acceptable conditions for tenants to beryllium surviving in, adjacent if the proportions are comparatively small.
"Local authorities reported proportionately much cases than backstage registered providers."
The RSH said providers had recorded and submitted accusation astir the fig of damp and mould cases they had successful a assortment of ways, meaning it was hard to accurately measure the grade of specified problems successful the assemblage overall.
The estimates are based connected the 4 cardinal homes that are owned and managed by ample registered providers who person much than 1,000 homes.
Fiona MacGregor, main enforcement of RSH, said: "Where determination are issues, landlords request to enactment present to enactment things right, earlier we commencement our progressive user regulation, including inspections of providers."
The regulator said that portion its findings showed that the immense bulk of radical surviving successful societal lodging person homes that are "largely escaped from damp and mould", those that bash person specified issues are astatine hazard from a superior interaction connected their wellness and wellbeing.
'Specific assurance'
In a informing to providers, the regulator said: "We expect providers to beryllium asking themselves however they tin improve.
"Regulation should not beryllium the lone operator for change."
Providers which reported a precocious prevalence of superior damp and mould oregon supplied mediocre prime accusation volition beryllium asked by the regulator to springiness "further, circumstantial assurance that they are identifying and addressing damp and mould cases".
In cases wherever providers are identified arsenic not gathering standards, the RSH said regulatory enactment volition beryllium taken, including publishing regulatory notices oregon regulatory judgments "where appropriate".
Local Government Association lodging spokesperson Darren Rodwell said councils were "determined to amended lodging conditions for each societal and backstage tenants".
He said: "The LGA continues to enactment with nonrecreational bodies, arsenic good arsenic the government, to sermon imaginable solutions connected improving lodging standards - including those relating to damp and mould successful tenanted properties."
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