Monitoring Well Manholes

Monitoring well manholes — surface completions for flush-mount and below-grade monitoring well installations. Cast iron and ductile iron covers with bolt-down and lay-in lids. Sizes from 5” to 18”.

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Monitoring Manhole Cover, Round 6" x 7.5", Ductile Lid (A0721-106) - product photo Monitoring Manhole Cover, Round 6" x 7.5", Ductile Lid (A0721-106) - alternate angle
All ProductsEMCO Wheaton Manholes

Monitoring Manhole Cover, Round 6" x 7.5", Ductile Lid

The EMCO Wheaton A0721-106 is a 6" monitoring well manhole with a painted ductile iron bolt-down lid and galvanized steel skirt. At just 6.3 lbs with a 7.5" overall height,...
$ 55.75
Monitoring Manhole Cover, Round  8"x8" Iron Lay-In Lid (A0721-188L) - product photo Monitoring Manhole Cover, Round  8"x8" Iron Lay-In Lid (A0721-188L) - dimensional drawing
All ProductsEMCO Wheaton Manholes

Monitoring Manhole Cover, Round 8"x8" Iron Lay-In Lid

The EMCO Wheaton A0721-188L is an 8" monitoring well manhole with a lay-in (drop-in) lid — no bolts required for routine access. The large notch on the lay-in lid eliminates...
$ 66.93
Monitoring Manhole Cover, Round 8"x12" Ductile Bolt Down (A0721-008) - product photo Monitoring Manhole Cover, Round 8"x12" Ductile Bolt Down (A0721-008) - alternate angle
All ProductsEMCO Wheaton Manholes

Monitoring Manhole Cover, Round 8"x12" Ductile Bolt Down

The EMCO Wheaton A0721-008 is an 8" monitoring well manhole with a painted ductile iron bolt-down lid and polyethylene skirt. The poly skirt resists corrosion in aggressive soil conditions and...
$ 83.67
Monitoring Manhole Cover, Round 5"X 8", Bolt down (A0721-105) - product photo Monitoring Manhole Cover, Round 5"X 8", Bolt down (A0721-105) - alternate angle
All ProductsEMCO Wheaton Manholes

Monitoring Manhole Cover, Round 5"X 8", Bolt down

The EMCO Wheaton A0721-105 is a 5" monitoring well manhole with a painted ductile iron bolt-down lid and galvanized steel skirt. Designed for smaller-diameter wells and piezometers, this compact unit...
$ 50.22
Monitoring Manhole Cover, Round 8" x 8" long metal skirt (MWL8008SM)
All ProductsManholes

Monitoring Manhole Cover, Round 8" x 8" long metal skirt

The Martin Products MWL8008SM is a 8" monitoring well manhole cover with a long galvanized steel skirt. Provides traffic-rated access protection for groundwater monitoring wells. The extended skirt height accommodates...
$ 122.00
Monitoring Manhole Cover, Round 4" x 8" Bolt-in Lid (MH48) - product photo Monitoring Manhole Cover, Round 4" x 8" Bolt-in Lid (MH48) - alternate angle
All ProductsManholes

Monitoring Manhole Cover, Round 4" x 8" Bolt-in Lid

The Koby Environmental MH48 is a compact 4" x 8" monitoring manhole cover with a bolt-in lid. Designed for small-diameter monitoring wells where a full-size manhole is unnecessary. The bolt-in...
$ 36.64
Monitoring Manhole Cover, Round 12" x 12" Bolt-down (A0721-101) - product photo Monitoring Manhole Cover, Round 12" x 12" Bolt-down (A0721-101) - alternate angle
All ProductsEMCO Wheaton Manholes

Monitoring Manhole Cover, Round 12" x 12" Bolt-down

The EMCO Wheaton A0721-101 is a 12" monitoring well manhole with a white painted ductile iron bolt-down lid and galvanized steel skirt. The steel skirt provides maximum structural rigidity in...
$ 169.54
Monitoring Manhole Cover, Round 3" x 6" Bolt-in Lid (MH36) - product photo Monitoring Manhole Cover, Round 3" x 6" Bolt-in Lid (MH36) - alternate angle
All ProductsManholes

Monitoring Manhole Cover, Round 3" x 6" Bolt-in Lid

The Koby Environmental MH36 is a compact 3" x 6" monitoring manhole cover with a bolt-in lid. Designed for small-diameter monitoring wells and piezometers where a full-size manhole is unnecessary....
$ 31.13
Monitoring Manhole Cover, Round 8" x 12" long metal skirt (MWL8012SM)
All ProductsManholes

Monitoring Manhole Cover, Round 8" x 12" long metal skirt

The Martin Products MWL8012SM is a 8" monitoring well manhole cover with a long galvanized steel skirt. Provides traffic-rated access protection for groundwater monitoring wells. The extended skirt height accommodates...
$ 125.00
Monitoring Manhole Cover, Round 8"x12" Black Ductile Steel (A0721-108) - product photo Monitoring Manhole Cover, Round 8"x12" Black Ductile Steel (A0721-108) - alternate angle
All ProductsEMCO Wheaton Manholes

Monitoring Manhole Cover, Round 8"x12" Black Ductile Steel

The EMCO Wheaton A0721-108 is an 8" monitoring well manhole with a black painted ductile iron bolt-down lid and galvanized steel skirt. The steel skirt provides rigid support in granular...
$ 91.47
Monitoring Manhole Cover, Round 8" x 8", 3-Bolts (A0721-308) - product photo Monitoring Manhole Cover, Round 8" x 8", 3-Bolts (A0721-308) - alternate angle
All ProductsEMCO Wheaton Manholes

Monitoring Manhole Cover, Round 8" x 8", 3-Bolts

The EMCO Wheaton A0721-308 is an 8" monitoring well manhole with a 3-bolt lid configuration and white painted ductile iron lid. The 3-bolt design provides secure closure with faster access...
$ 78.09
Monitoring Manhole Cover, Round 8"x  8" long plastic skirt (MWL8075PL)
All ProductsManholes

Monitoring Manhole Cover, Round 8"x 8" long plastic skirt

The Martin Products MWL8075PL is a 8" monitoring well manhole cover with a long polyethylene skirt. Provides traffic-rated access protection for groundwater monitoring wells. The extended skirt height accommodates deeper...
$ 90.91

Flush-Mount Well Access

When a monitoring well needs to be completed at grade — in a parking lot, sidewalk, or paved area — a monitoring well manhole provides the surface-level access point. The manhole frame sits flush with the surrounding surface, and the cover protects the well casing below.

These are different from standard sewer manholes. Monitoring well manholes are smaller (typically 5” to 18”), designed to accommodate well casing rather than human entry, and often require bolt-down or locking lids for regulatory compliance.

Key Considerations

  • Traffic loading — Will vehicles drive over the cover? If yes, choose ductile or cast iron with appropriate load rating.
  • Well casing size — The manhole opening must accommodate your well casing diameter plus any above-ground fittings (caps, plugs, sampling ports).
  • Security — Bolt-down lids prevent unauthorized access and satisfy most regulatory requirements for well security.

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FAQ

What’s the difference between a monitoring well manhole and a standard manhole?

Monitoring well manholes are smaller (5”–18” vs. 12”–44”+) and designed for well casing access, not human entry. They’re used for flush-mount well completions in paved areas.

Do I need a manhole AND a well plug?

Typically yes. The manhole provides the surface-level access frame. The well plug or cap seals the actual well casing inside the manhole. They serve different functions.