How do I prove a toilet is leaking when nothing is wet?

With food coloring. Put it in the tank, declare that bathroom closed for a half hour, then lift the seat. Dye in the bowl proves water is getting by the flapper, and the meter has been counting it.

My toilet moves a little. Does that matter?

It does. Movement wears the wax ring thinner each time, and when a gap finally forms a bit of every flush leaks out at the floor, often unseen for months. In an upstairs bath or an attached home, the first evidence may be a mark on the ceiling below, possibly a neighbor's. Have it pulled and reset while the subfloor is still solid.

Should I fix a toilet from the 1980s or replace it?

Fix it if the china is sound and it flushes well on new tank parts. Replace it for a crack in either the tank or the bowl, for a flush that routinely takes two tries, for water use above 1.6 gallons a flush, or because a taller bowl would suit someone you live with.

Laguna Niguel Toilet Repair, Replacement and Upgrades

Laguna Niguel toilets: what breaks and how we fix it

Toilet work takes us into Laguna Niguel's houses and attached homes, and into Ladera Ranch, San Juan Capistrano, Laguna Beach, Aliso Viejo, Laguna Hills and Laguna Woods. A toilet is a simple machine with three places to fail. Inside the tank, a flapper holds the water back, a fill valve lets it in and a flush valve lets it go. At the floor, a wax ring seals the bowl to a flange, and two closet bolts hold it down. On the wall, a shutoff controls the supply. Each part wears in a known way, which is why the fix is seldom a mystery, and the figure for it is on paper before the lid comes off.

Take a rocking bowl seriously. Wax does not spring back: every time the toilet shifts, the ring under it is squeezed a little thinner, until a gap forms and part of each flush escapes at floor level. On a ground floor that water travels under the flooring. In a two-story house it comes through the ceiling below. In an attached home, the wall or ceiling it reaches may belong to a neighbor or to the association, and the CC&Rs decide who repairs what. Wedging the base does not cure it. The toilet comes up, the flange is inspected, and whatever allowed the movement is put right before a new ring goes down.

Hard water wears toilets from the inside. The two plants that treat the Moulton Niguel Water District's supply reported hardness of 236 and 293 mg/L for 2025, and that mineral builds up on fill valves until they stick and in the rim holes until the flush loses its swirl. An older toilet with a lazy flush is often scaled, not clogged. A cracked tank is replaced; adhesive on porcelain that holds water is not a repair. For a new toilet we start with the rough-in, the gap between the finished wall and the middle of the drain, because that number decides which bowls will fit. The flange has to finish even with the floor surface, the ring and bolts are new, and the supply ends at a quarter-turn stop you can shut with two fingers.

What turns up when the lid comes off

A flapper hardened by age that no longer sits flat
Tank water set above the overflow tube, draining away as the valve keeps filling
A fill valve crusted with mineral, or rim holes narrowed by scale
A wax ring flattened by a bowl that rocked on slack bolts
A flange stranded below the surface after new tile or plank was laid over the old floor
A blockage downstream, beyond anything a plunger can reach

Six reasons to call about a toilet

Refilling sounds from a toilet nobody just used
Any give in the bowl when weight goes on it
A wet ring on the floor at the base after flushing
A yellowed patch on the ceiling directly below a second-floor toilet
One flush is no longer enough
Sewer odor in the bathroom that appears and fades

Keep the toilet or change it

Sound porcelain is worth keeping. A bowl and tank can outlive many sets of internal parts, and replacing those parts is usually the right call. Three things justify a new one: a crack anywhere in the china, a flush that has needed a second pull for a long while, or a family member for whom a taller bowl is easier. Water is the fourth reason, and here it is a legal one. California's water-saving fixture law reaches any home built no later than January 1, 1994, and for a toilet it sets the ceiling at 1.6 gallons per flush. In Laguna Niguel, homes from before 1980 make up 24 percent of the total and homes from the 1980s another 44 percent, so most homes here are old enough for the rule to apply. If you are replacing one, see what SoCal Water$mart, the regional rebate program, is offering first.

You get that recommendation before anything is unbolted. When parts will do the job, parts are what we propose, even though a full replacement is the larger job.

Trouble that starts farther down the pipe

A toilet can report a problem that is not its own. If other drains have slowed too, if draining the tub makes the toilet gurgle, or if a plunger just moves water back and forth, the blockage is in the main drain or in the lateral that carries everything to the sewer. Who owns that lateral depends on the address. Under Moulton Niguel Water District standards it is generally the customer's, the wye at the main included. In Laguna Beach the homeowner's part generally runs the whole distance, connection to the City's main included; ask the City about its lateral repair reimbursement program. In Laguna Woods Village, housing and common-area services belong to the three mutuals, so start with yours. One more local fact: the Moulton Niguel district moves sewage over the ridgelines with 17 lift stations, and wipes jam pumps as readily as pipes, so put them in the trash. We run a camera before anyone digs. The pages on drain cleaning and on sewer repair go into that work.

A leak with no puddle, and how to prove it

When a flapper stops sealing, tank water slips past it around the clock. There is no drip to hear and nothing on the floor. The level in the tank sags, the fill valve opens to restore it, and the Moulton Niguel meter counts each refill. What gives it away is the bill: higher than usual in a month when nothing about the household changed.

Food coloring settles the question. Tint the tank well, then stay away from the handle for a half hour. Any color that has reached the bowl got there past the flapper. Run the same test in every bathroom, since flappers of one age tend to give out in the same season. Water on the floor at the foot of the toilet is another fault, and a more pressing one. For that, call at any hour.