It doesn't get anymore oxymoron than this

[SHRED]

Saw this in Idaho where we are camping.

[mr_lebowski]

1. Seen those hundreds of times in my life ...

I think the idea it's meant to convey is that there's excrement in the sewer below, i.e. it's not a storm sewer.

[SHRED]

2. I worked in Stormwater/Flood control for years

I've never heard of stormwater drains being called "sewer".

[mr_lebowski]

4. Well, they are ...

From Wiki:
"A sanitary sewer or foul sewer is an underground pipe or tunnel system for transporting sewage from houses and commercial buildings to treatment facilities or disposal. Sanitary sewers are part of an overall system called a sewage system or sewerage"

But bottom-line I think it's meant to 'tactfully' convey ... that there's shit below this lid, i.e. that 'this is part of the sanitation system'.

Granted, "Sanitation Sewer" would make more sense, and it IS arguably an oxymoron ... but I used to see that on those lids all the time growing up.

[Generic Brad]

3. Idaho? Why does it say India?

That's an odd artifact to nick.

[SHRED]

5. Manhole covers

Apparently millions were manufactured in India.
I saw them in SoCal also.

Apparently we don't have the technology to produce them.

[mr_lebowski]

6. It's Made in India ... (nt)

[Beakybird]

7. I hit my tailbone on one. Had a sewer behind.

[Fla Dem]

8. Ouch!