WellCollarOhio Class II disposal well integrity testing and pressure limits
The quarterly report is the part of running a disposal well everyone remembers. The integrity rules are the part that can shut the well down. Here's the pressure limit, the tests and the deadlines in one place.
Last checked against official sources October 25, 2026 · Written by Green Collar Industries, a veteran-owned operator in Coshocton County, Ohio
| Pressure limit | (0.75 − 0.433 × 1.2) × depth to the top of the shallowest injection formation, in psi at the surface, unless your permit sets another |
|---|---|
| MIT part 1 | At least every 5 years; 24 hours' notice to the inspector; results filed within 30 days |
| Automatic shut-off device | Tested every year |
| Brine pipelines | Pressure tested at least every 5 years, after repair or replacement, or on request; 48 hours' notice; the division witnesses it |
| Annulus | Monitored and recorded continuously, kept positive, data kept for the life of the well |
| Rule | Ohio Administrative Code 1501:9-3-07(C), (D) and (F) |
The maximum allowable injection pressure
Unless the permit or an approved plan sets a different number, the surface injection pressure limit is figured from the depth to the top of the shallowest formation you inject into:
Limit (psi) = (0.75 − (0.433 × 1.2)) × depth in feet, which works out to about 0.23 psi per foot.
| Top of injection zone | Limit |
|---|---|
| 3,000 ft | about 691 psi |
| 4,000 ft | about 921 psi |
| 6,000 ft | about 1,382 psi |
The chief can also set a graduated limit below the maximum. Use the number on your permit when it has one.
If the pressure goes over
The well needs an automatic shut-off device. If the limit is exceeded, injection stops immediately and the inspector must be told within 24 hours. Before injecting again, the well has to pass MIT part 1 and the shut-off device has to be tested. Repeat exceedances within 365 days escalate: a 24-hour suspension, then 14 days, then 30 days, and permit revocation on the fourth.
Mechanical integrity tests
- MIT part 1 is due at least every five years, and whenever the chief asks. Tell the inspector at least 24 hours ahead, file the results within 30 days, and keep the records at least five years.
- MIT part 2 can be required for good cause.
- If integrity fails, suspend injection right away, notify the division within 24 hours and submit a plan to fix it.
The daily records that go with it
The same rule requires injection pressure and volume to be monitored and recorded every operating day, annulus pressure monitored continuously and kept positive, and the wellhead looked over every day the well is injecting. Those daily records are also where the monthly figures on the quarterly report come from.
Where operators get tripped up
- Losing track of a five-year test. Five years is long enough that nobody remembers the last date. Put the next one on a calendar the day you pass.
- Skipping the notice. A test the inspector wasn't told about may need to be run again.
- Results that never got filed. The 30-day filing is its own deadline.
- Not knowing your number. If the pumper doesn't know the limit, nobody notices when a reading crosses it.
Tests on the calendar, readings checked against the limit
WellCollar stores each disposal well's pressure limit, or works it out from the injection depth, and checks every daily reading against it. MIT, shut-off and pipeline tests show when they're next due, with the inspector notice and the 30-day results filing tracked and the test chart attached. Due dates go on your to-do list with reminders.
Official sources
This guide explains the rules in plain English and is not legal advice. Forms and rules change, so check the current form and your permit before you file. Last checked October 25, 2026.
Other guides operators use
Common questions
How often is an MIT required on an Ohio Class II disposal well?
MIT part 1 is required at least every five years, or when the chief requests it, with 24 hours' notice to the inspector and results filed within 30 days.
How is the maximum injection pressure figured in Ohio?
Unless the permit sets another limit, it's (0.75 − (0.433 × 1.2)) times the depth in feet to the top of the shallowest injection formation, about 0.23 psi per foot.
How often must the automatic shut-off be tested?
Every year (OAC 1501:9-3-07(D)(3)).
What happens if a disposal well exceeds its pressure limit?
Injection stops immediately, the inspector is notified within 24 hours, and the well must pass MIT part 1 and a shut-off device test before restarting. Repeat exceedances within a year bring suspensions of 24 hours, 14 days and 30 days, then permit revocation.
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