A whistleblower is about to turn on the Census Bureau.

A few years back, I broke the story that there had been massive falsification of data in the Philadelphia region of the Census Bureau.

There was an investigation by the inspector general (IG) of the Commerce Department, which runs Census. And there was a congressional probe by the House Oversight Committee, which has permanent authority over Census.

And there was an investigation by me.

The IG’s office found wrongdoing but downplayed the extent of it. The Oversight Committee, which is now busy with Hillary Clinton’s emails, recommended changes in the way data are processed and said there was pressure on data gatherers and their bosses to cheat.

My own investigation found that data falsification was rampant in the Philadelphia region, was occurring in the other five regions of Census as well, and this was affecting the quality of economic, crime, health and other data being given to a wide variety of government agencies.

Some management people at Census suddenly retired. At least one was quickly reassigned. And the percentage of completed surveys dropped precipitously — not surprising since, with the new scrutiny, it became harder for Census workers to forge results.

It’s now three years later and (as you’ll see in a moment) the economic data being produced by Washington are again suspect and having an impact on the presidential election.

So it is interesting that another whistleblower would like to pick up where my original sources on the Census story left off.

“As I am sitting here typing this message there were actually multiple supervisors that encouraged this type of activity, but again that was lost in the [congressional] report and IG investigation,” this new whistleblower wrote to me recently. I have since spoken with this person by phone several times.

The whistleblower called the original IG investigation “flawed” and said more information will be passed on to authorities very soon. “The entire matter becomes more important when you take a look ahead to the 2020 Census,” the source said, referring to the multibillion-dollar survey that takes place every 10 years and is mandated by the US Constitution.

The whistleblower will file the allegations anonymously with Census because of possible reprisals. But names of alleged offenders and details of the schemes will be revealed to the IG, as they were to me.

A spokesman says: “The US Census Bureau encourages all employees to contact the [inspector general] if they suspect any fraud, waste and abuse.”

Whether you want me to or not, I’ll keep you posted.