Meet the locals who paddle this polluted New York canal.

Recently, I watched a report about it, and I was really interested in it because my mum is works ing in the sewage treatment.

These are two complete sentences separated by "and", so you would use a comma here. Remember to clarify what you were interested in. Here, you were interested in "it" - the report. "My mum works" is a bit more natural than "my mum is working" - the first one tells us what her job is whereas the second one refers more to what she is currently doing in this moment.

In this report, we follow a man who talks about it.

Remember your conjugation here. "Man" is your subject, so it would be "man who talks about it" instead of "man who talk about it".

So, iIn the Gowanus Canal, in New York, there is a lot of pollution.

To start a sentence with "So" is a bit casual. You can do it though, it's not technically wrong.

It's an old canal which wasthat use to be a waterway where chips could bring in coal, lumber, and steel.

It was pollutcausing a lot of pollution but the worset of it came when a man had the bright idea to dig a deeper canal in order to permit biggestr chip to come hentere.

"Causing a lot of pollution" is more natural than "polluting". "Biggest" would prefer to the absolute largest chips that could come. Here, "bigger" would be better because it's comparing it to the size of the chips that came before.

There wasere many chips which came and go andthat polluted the water.

The pollution is also due tocaused by people who drop their rubbish on the ground everything is finishing the water.

"Rubbish" is spelled with two b's. I'm not sure what you meant by the last part of your sentence so I eliminated it.

Therefore, to show us how dirty the water was dirty, they showed us what they can find in it.

Everything with a huge filthas dirty.

Every week-end, they spend their day to cleaning up the water, and the result was quite impressive.

We don't use a hyphen for "weekend".

I really admire them because they repair the other'sfix other peoples' mistakes, and they're doing such a good job!

In 2009, they succeed to have thegot help ofrom the Environmental Protection Agency.

They were also more recognized and appreciated by the people who started to enjoy paddling in the water.

"Recognized" has a "g".

Nowadays, the canal is cleaner but still a bit dirty, so it's obvious that you still need have to cleanupto wash your hands after touching the water, but. However, it's more enjoyable to paddle in.

To conclude, I want to say that every people like them are really inspiring and I'm really thankfull for their jobwork.

You can just say "people" instead of "every people". We would also say "thankful for their work" instead of "for their job". Job typically refers to something that you get paid for, but work could be anything that you accomplish.

Tell me howwhat you foundthink of my English!

Hello, today I'll be talking about the people who paddle on a very polluted New York canal and try to cleanup it up.

You are referencing a specific group of people, so "the people"

Recently, I watched a report about it and I was really interested in because my mum is works ing in the sewage treatment.

What your mom does for work (in general): my mom works in...

In this report, we follow a man who talks about it.

So, iIn the Gowanus Canal, in New York, there is a lot of pollution.

You might begin with a "so" while speaking in person, but you would avoid it for texts (since you have the time to edit it properly).
If you're looking for a smooth way to introduce this section, I would suggest "This takes us to the Gowanus Canal..."

It's an old canal which was (once) a waterway where cships could bring intransport coal, lumber and steel.

"Once" would fit naturally here as a way to reference what it used to be for. "Transport" would also sound better for this text

It was polluting a lotThis caused a lot of pollution, but the worset came when a man had the bright idea to dig a deeper canal in order to permit the biggest cships to come herethrough.

I would avoid using "here" if you the writer are not where "here" is. In this case, we can just use "through" (=through the canal)

As a matter of fact, it was tota really a terrible idea!

More natural

There wasere many cships whichthat came and go andwent which polluted the water (more and more).

I would add this extra bit at the end to emphasize how the pollution got worse with time

Theoday, the existing pollution is also due to people who drop their rubbish on the ground everything is finishing, which eventually reaches the water.

Since we've been in past tense talking about the evolution of the pollution in the canal, I would add something like this at the start to segue into present day (and present tense)

Therefore, to show us how dirty the water was dirtyis, they showed us what they can find in it.

Everything with a hugeas filthy / everything was covered in filth.

Filth / filthy is already really strong, you generally don't need a modifier for it

The man in the report said that he loved paddling and wanted to paddle there.

Every week-end, they spendt their day tos cleaning up the water, and the result was quite impressive.

You need past tense (spent) to agree with the end (was impressive)

Alternative: Every weekend, they spend their days cleaning up the water, and the results are quite impressive. <= This highlights that they are still working on cleaning the canal, but already, the results are noticeable. Here, both verbs are in present tense (spend / are impressive)

I really admire them because they arepair the other working to fix other people's mistakes, and they're doing such a good job!

In 2009, they succemanaged to have theget help ofrom the Environmental Protection Agency.

More natural

They were also more recognized and appreciated by the people who started to enjoy paddling in the water.

Nowadays, the canal is cleaner, but still a bit dirty, so it's obvious that you still need have to cleanupto wash your hands after touching the water, but it's still more enjoyable to paddle in.

Need = have to ; you would not say both together.

Generally, you will never use "clean up" for your hands, but "wash"

I would add a "still" for the contrast of negative into positive (it is dirty, but better than before)

To conclude, I want to say that every peoplerson like them areis really inspiring, and I'm really thankfull for their jobwork.

"Every" needs a singular word after it

A job is a position that you get paid for, but you can do work outside of your job (such as picking up trash in your community)