Comal County Septic Questions, Answered

For an aerobic system on a typical Hill Country lot, $13,000 to $22,000. A standard three-bedroom aerobic install on easier ground runs closer to $11,000 to $13,000. Well and septic together in the unincorporated county is often quoted at $8,000 to $15,000. Full breakdown.

Because they are averaging conventional septic systems from across the country. A conventional system needs soil deep and absorbent enough to treat effluent through a gravity drainfield. Most of Comal County is thin soil over limestone, which cannot, so most local properties need a far more capable aerobic system instead.

The aerobic treatment unit itself, at $4,000 to $8,000. After that, distribution ($2,000 to $5,000) and rock work ($2,000 to $5,000 for trenching, plus $1,500 to $4,500 for difficult excavation).

Usually because they are pricing different systems, different sizing, or different assumptions about rock. Ask every bidder to itemise tank, distribution, excavation, electrical, panel, design and permit, and the gap normally explains itself.

If it is an aerobic system, a maintenance contract at $200 to $500 a year, required by state law for as long as you own it. Plus periodic pumping — $300 to $450 for a pump-out.

Yes. Comal County is a TCEQ Authorized Agent and the Comal County Engineer's Office issues OSSF permits. You need an Authorization to Construct before work begins and a Notice of Approval or License to Operate before the system may be used. The nine steps.

Major repairs and system modifications generally do; routine maintenance does not. Confirm with the Engineer's Office at 830-608-2090 before work starts.

A standard system may be planned by the installer. Complex, non-standard or proprietary systems require a professional engineer or registered sanitarian. On the Edwards Aquifer Recharge Zone, planning materials must be submitted by a PE or professional sanitarian regardless.

Class I (OSI) may install standard systems — septic tanks, absorptive drainfields, unlined ET drainfields, leaching chambers, graveless pipe and pumped effluent drainfields. Class II (OSII) may install all types, including aerobic units. If you are getting an aerobic system, you need an OSII.

Three during installation. Notify the county at least 24 hours before each. A system that fails an inspection draws a $150 reinspection fee.

Comal County maintains a fee schedule that changes over time, so call 830-608-2090 for the current amount rather than trusting a figure online. The one fee we can state confidently is the $150 reinspection fee.

A minimum of one acre (43,560 sq ft) per single-family dwelling, though some counties with pre-established plat records are exempt; tanks at least 50 feet from a recharge feature; soil absorption systems at least 150 feet; and planning materials filed only by a professional engineer or professional sanitarian. Details.

Only a licensed site evaluator can answer that, from a soil test. In practice, thin soil over limestone rules out conventional drainfields on much of the county, and roughly half of all new Texas septic permits today are for aerobic units.

A powered system that injects air so aerobic bacteria treat wastewater far more completely than in a conventional tank, disinfects the result, and distributes it through spray heads or subsurface drip lines. It does the treatment the soil cannot. How they work.

Spray costs less and suits larger, flatter lots. Drip costs more, needs less surface area, and suits small, steep or landscaped lots. It is usually set by the system design rather than being a free choice.

Comal County recognises septic tanks with absorptive drainfields, aerobic treatment units, sand filters, trickling filters and constructed wetlands. Which are viable on your lot comes out of the site evaluation.

Yes, for aerobic systems. Texas Health & Safety Code 366.0515 requires an active contract with a TCEQ-licensed maintenance provider. Fines for non-compliance can reach $100 per day. What it covers.

Three times a year, every four months — or every six months if the system has electronic monitoring that tracks failures and disinfection levels. Reports go to the county within 14 days of each visit.

Every three to five years is the common rule for a conventional household system, but it depends on tank size, occupancy and water use. Having the sludge depth measured once gives you a real interval for your house. More.

No. A healthy system already has the bacteria it needs, and additives do not remove the solids that pumping removes. Some do harm.

Wipes — including "flushable" ones — grease, paint, solvents, cat litter, and bleach in quantity. On an aerobic system, harsh chemicals kill the bacteria doing the work.

Standing water or mushy ground over the system; a strip of unusually green, spongy grass in dry weather; sewage smells near the tank or spray field; drains slowing throughout the house; gurgling; backups. Full list.

Check the breaker first. If power, floats and aerator all check out and a high-water alarm persists, it is most often the pump. Other common causes are aerator failure, low air pressure, a faulty timer, or clogged spray heads. Call your licensed maintenance provider — do not just silence it.

Sometimes, but soil that has been biologically clogged by solids generally does not recover, so it becomes a replacement. Mechanical parts — pumps, aerators, floats, timers, spray heads, lines — are repairs.

Not necessarily. A replacement is permitted against current rules, not the rules in force when the original went in. Owners replacing older conventional systems are often told an aerobic system is now the only compliant option on that lot.

Not by statewide law. But most lenders require a satisfactory inspection as a financing condition, and many Texas counties require inspections at transfer. Confirm what applies to your transaction with the county. More.

Proof of a valid maintenance contract. A lapsed contract is the single most common septic problem that holds up a Comal County closing.

Whether a contract is in place and in whose name, the last few inspection reports, the original permit and as-built, the bedroom count the system was permitted for, and whether the property is on the Recharge Zone. The maintenance obligation becomes yours the day you close.

Weeks, not days. Soil evaluation, design, county review, Authorization to Construct, installation, and three inspections that each need 24 hours' notice. If the septic permit sits on the critical path of a build or a closing, start earlier than feels necessary.

Usually a few days on a straightforward site. Rock and slope extend it.