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Combined statistical area (CSA) is a United States Office of Management and Budget (OMB) term for a combination of adjacent metropolitan (MSA) and micropolitan statistical areas (µSA) across the 50 US states and the territory of Puerto Rico that can demonstrate economic or social linkage. The OMB defines a CSA as consisting of various combinations of adjacent metropolitan and micropolitan areas with economic ties measured by commuting patterns. These areas that combine retain their own designations as metropolitan or micropolitan statistical areas within the larger combined statistical area.
The primary distinguishing factor between a CSA and an MSA/µSA is that the social and economic ties between the individual MSAs/µSAs within a CSA are at lower levels than between the counties within an MSA. CSAs represent multiple metropolitan or micropolitan areas that have an employment interchange of at least 15%. CSAs often represent regions with overlapping labor and media markets.
As of March 2020, there are 172 combined statistical areas across the United States, plus another three in the territory of Puerto Rico.

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  1. M

    Combined vanity and concealed wc

    I have a cloak room that has a width of 1035mm that I am wanting to put a combined concealed toilet and vanity in. I was looking at a 550mm concealed toilet and 450 basin. But apparently the 450mm basin vanity of this model is incompatible with the 550mm concealed toilet unit. Has anyone managed...
  2. ameliacm

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  3. A

    Smelly combined pipe running through winter garden balcony

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  4. M

    Will Building Control permit a combined rainwater / sewage system?

    Our Victorian house's rainwater down-pipes are connected to the foul-water sewer. In order to accomodate new wider French windows I want to move the existing soil stack. When they see the plans or site do you think Building Control will want to alter the existing rainwater arrangements? All the...
  5. F

    Combined vent and cold feed

    Hi guys Is it normal for the cold feed pipe from the f&e tank to be combined with the open vent? The cold feed connects to a 22mm tee one end is the vent the other cold feed to rads I thought the vent connects to ch flow and the feed to ch return? Thanks in advance
  6. A

    Combined waste to stack query

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  7. A

    Combined bath/shower wastes

    Hi. If I want to connect bath and shower wastes so they come out of the same pipe to the soil stack, what size does it have to be? 50mm? I've read that I need and anti-syphon valve too, as the shower waste run will be over 2 meters, under the bath. Do the bath and shower wastes have to be 40mm...
  8. B

    Arezzo Instant boiling water tap - No hot water input

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    • Forum: USA
  9. Z

    Combined rainwater and soil stack?

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  10. T

    Connector for combined bath overflow and supply

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  11. exedon2

    Oil fired aga combined feed and vent

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  12. R

    Creating combined feed & vent

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  13. C

    Has anyone fitted a combined bath trap and pop up waste like this one, who is manufacturer? Thanks

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    • Replies: 13
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  14. B

    Combi boiler combined with immersion heater using solar PV

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  15. M

    combined toilet bidet back flow prevention

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  16. M

    Combined direct vented hot water cylinder

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  17. M

    Combined feed and vent with unvented cylinder

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  18. Inverness

    Acv oil combined hit water and heating

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  19. R

    Expansion Vessel Combined Boiler

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  20. P

    Combined UFH and radiator system

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