Moen Flo 900-001 shutoff
$559.00 at Amazon
Check it on AmazonPrice as of Oct 24, 2026, 5:30 AM EDT
What household water waste costs per year
Measure the loss. Find the charges a repair can reduce.
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Quick answer
Household water waste cost depends on measured loss and your utility’s rates. Check the meter first. Consider Moen’s Flo 900-001 for automatic shutoff; a confirmed toilet leak needs its own repair.
For main-line shutoff: Moen Flo 900-001$559.00 at AmazonPrice as of Oct 24, 2026, 5:30 AM EDT
Check it on AmazonAn option for monitoring and automatic shutoff
You can measure waste with your existing meter. This device adds monitoring and valve control after you check installation fit.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
| Tool | Key specs | Pick it if | Skip it if |
|---|---|---|---|
| Moen Flo 900-001 shutoff | Model 900-001, 3/4-inch NPT, Cold main supply, 2.4 GHz Wi-Fi | You want main-line valve control, can activate it with Moen’s app and maintain internet access, and a licensed plumber has confirmed the pipe, power and sprinkler arrangement. | You only need to diagnose a toilet leak, cannot provide safe power and internet access, or cannot meet Moen’s placement restrictions. |
What to check before adding a shutoff
The Flo 900-001 belongs on the monitoring side of a home water audit. Moen’s specification describes automatic, remote and manual valve control, plus flow readings in its app. Those functions help you watch consumption and manage supply. They do not identify a toilet’s failed seal or replace a repair.
The 900-001 includes two 3/4-inch NPT brass tailpieces. Have a licensed plumber confirm pipe fit and accessible cold-main placement after the water meter, manual shutoff and pressure-reducing valve, where applicable. Pipe size alone does not establish installation fit.
Moen requires continuous power. Its older specification calls for an outlet within 6 feet; the newer guide says 10 feet. Plan around 6 feet until Moen confirms your unit’s requirement. Do not use high voltage extension cords to reach a distant outlet.
Where it does well
- Automatic, remote and manual water shutoff
- App displays flow, pressure and temperature
- Includes two 3/4-inch NPT brass tailpieces
What to watch
- Requires main-line installation and continuous power
- App required for activation; internet loss can cause frequent Local Mode shutoffs
- Cannot sit upstream of a residential fire-sprinkler branch
Neither the device nor its power supply may be buried or exposed to ambient temperatures below 32°F (0°C) or above 140°F (60°C). Mount the power supply off the ground. Outdoor installations require a weatherproof receptacle enclosure at least 12 inches (305 mm) above ground.
Moen requires 2.4 GHz Wi-Fi and a smartphone with its Smart Water App for activation and alarm notifications. Confirm internet access at the device, beyond Wi-Fi coverage. Moen warns that an internet-disconnected device enters Local Mode and can experience frequent water shutoffs; reconnecting to the internet exits Local Mode.
Moen prohibits placement upstream of a residential fire-sprinkler branch. A licensed plumber must confirm a compliant location, shut off the main, drain fixtures and relieve pressure before cutting. Moen lists safety glasses. Leave electrical changes to an electrician.
My call: finish the worksheet before deciding whether valve control answers your problem. If tank-to-bowl leakage explains the extra gallons, repair the toilet and repeat the meter check. Choose this device for its monitoring and shutoff role, without assuming a particular reduction in your water bill.
Compare the next actions by what they solve
| Option | What it does | Fit or evidence needed | Limit / next step |
|---|---|---|---|
Moen Flo 900-001 | Monitors usage and controls supply | 3/4-inch NPT; compliant placement and continuous power; 2.4 GHz Wi-Fi, internet and app activation | Professional installation; no downstream sprinkler branch Check price on Amazon |
| Existing utility meter | Measures total water passing the meter | Start/end readings; same units; timed no-use interval | No purchase needed; movement does not locate the leak |
| Toilet dye check | Shows tank-to-bowl leakage | Color reaches the bowl without flushing after 10 minutes | Identify the sealing or overflow fault before selecting a repair |
| Fixture flow measurement | Estimates a use-related saving opportunity | Measured gpm and actual minutes of use | A higher-flow working fixture is separate from a leak |
What household water waste can cost per year
EPA’s household leak estimate provides context. Your own measured gallons and utility tariff establish the avoidable charge.
EPA WaterSense says the average household’s leaks can account for more than 9,300 gallons each year. It also reports that 9% of homes have leaks wasting at least 50 gallons a day. These are published household estimates, not measurements of your property.
For an annual cost of household leaks, the useful question is how much your bill changes when those gallons disappear. A water base charge may remain. Sewer may follow a separate calculation. Multiplying the entire bill by a water-saving percentage can therefore give the wrong answer.
| Published figure | What it establishes | What it cannot tell you |
|---|---|---|
| More than 9,300 gallons/year | EPA’s household leak context | Your home’s actual loss or tariff |
| 9% of homes: 50+ gallons/day | EPA’s reported share with larger leaks | That every toilet loses 50 gallons/day |
| About 10% water-bill savings | EPA’s estimate for easily corrected leaks | A guaranteed saving from buying a device |
Use the dated Cobb County example below to see the arithmetic. Assume a continuous loss of 2 gallons per hour, with every added gallon charged at Cobb’s $5.95 per thousand water tier. Also assume its $7.51 per thousand sewer charge applies to all of that loss.
That assumed leak uses 48 gallons a day. It adds 1,440 gallons over 30 days, or 17,520 gallons over 365 days. These figures describe the example’s steady flow. A toilet that leaks intermittently needs its observed operating duration instead of an automatic round-the-clock assumption.
| Period | Assumed excess gallons | Water charge | Sewer charge | Total |
|---|---|---|---|---|
| 30 days | 1,440 | $8.57 | $10.81 | $19.38 |
| 365 days | 17,520 | $104.24 | $131.58 | $235.82 |
Calculated from Cobb’s rates effective June 1, 2026: gallons ÷ 1,000 × the applicable rate. Totals are rounded to cents. The annual example holds flow, tariff and applicable tier constant for illustration; it is not a forecast or a national average.
Build your home water waste report
Use matching row names in both halves of this worksheet. Record observations first, then attach the bill charges that actually change.
Keep a copy of the bill beside the report. Write its start and end dates, the utility’s name and the unit used for consumption. Mark each result measured, estimated or unresolved. An unexplained meter change is a starting point; it becomes a confirmed fixture loss only after you isolate its cause.
The whole-home row is a control total. It already includes any leaking toilet or faucet served by that meter. Do not add it to the fixture rows. If individual estimates exceed the meter total, check units, time periods and overlapping observations before attaching dollar amounts.
| Check / location | Measurement and observation time | Evidence status | Next action |
|---|---|---|---|
| Whole-home unexplained flow | Meter start/end; time; units | Control total only | Exclude known automatic use; locate the remainder |
| Toilet tank-to-bowl leakage | Dye result; observed refill periods | Measured or unresolved | Separate seal leakage from overflow or refill trouble |
| Faucet dripping while closed | Safely collected volume and time | Measured or estimated | Identify the faucet and failed sealing part |
| Shower flow above baseline | Existing gpm; baseline gpm; minutes/day | Efficiency opportunity | Compare intended spray and actual use |
| Bathroom faucet above baseline | Existing gpm; baseline gpm; minutes/day | Efficiency opportunity | Check outlet fit and intended sink use |
| Irrigation loss or unintended run | Zone; observation time; active minutes | Measured or unresolved | Check schedule before assuming a buried leak |
| Other unexplained use | Equipment cycle; time; meter change | Unresolved until traced | Check treatment cycles and seek help if unexplained |
| Matching check | Flow and active duration | Excess gallons / 30 days | Water (W) / sewer (S) avoided | Total avoidable charge |
|---|---|---|---|---|
| Whole-home unexplained flow | ______ | ______ | W ____ / S ____ | ______ |
| Toilet tank-to-bowl leakage | ______ | ______ | W ____ / S ____ | ______ |
| Faucet dripping while closed | ______ | ______ | W ____ / S ____ | ______ |
| Shower flow above baseline | ______ | ______ | W ____ / S ____ | ______ |
| Bathroom faucet above baseline | ______ | ______ | W ____ / S ____ | ______ |
| Irrigation loss or unintended run | ______ | ______ | W ____ / S ____ | ______ |
| Other unexplained use | ______ | ______ | W ____ / S ____ | ______ |
If sewer treatment is unresolved, write “unknown,” not zero. Keep the shower and faucet efficiency rows separate from confirmed leak totals. These paired tables can be printed; no household readings are uploaded by the worksheet.
For continuous loss, multiply gallons per hour by 24 and then by 30. For an intermittent event, multiply its measured flow by the time it actually runs. A toilet that refills between flushes may need several observations; a single quiet interval can miss the event.
For a fixture opportunity, subtract the selected replacement flow from the existing measured flow, then multiply by minutes per day and 30 days. If the replacement flow is higher, record zero savings. That is a comparison between use scenarios, not a repair of water escaping from a closed fixture.
Use our water leak cost calculator for an individual volume-and-charge calculation. Keep the worksheet as the place where you reconcile all rooms. It prevents several independent estimates from becoming one inflated household total.
Read the charges that change with use
| Bill item | Can removing a leak reduce it? | What to check |
|---|---|---|
| Water consumption | Usually, under the applicable tariff | Marginal tier, billing unit and rounding |
| Water base charge | Often remains | Account or meter charge versus included gallons |
| Wastewater / sewer | Depends on the billing formula | Current consumption, minimum, cap or another basis |
| Stormwater or other fixed fee | Do not count without a rule | Whether the fee changes with metered water |
| Repair or property damage | Separate from this subtotal | Written repair scope; damage assessment |
Cobb’s single-family residential table effective June 1, 2026 lists water tiers from $3.85 to $11.25 per thousand gallons. Its wastewater rate is $7.51 per thousand. The $5.95 water tier used above is one band, not a single rate for all Cobb households or all their gallons.
When a leak crosses a tier boundary, calculate the consumption charge with the leak, calculate it without the leak, and subtract. The removed gallons may occupy more than one band. Ask the utility how it rounds billed units rather than treating the printed band labels as a complete billing algorithm.
| Utility example | Dated published rule | Why it changes the estimate |
|---|---|---|
| Cobb County | June 1, 2026: tiered single-family water; $7.51/1,000 gallons sewer | Apply only the water bands and sewer rules affecting the removed volume |
| Marietta | January 1, 2026: $15.59 residential monthly water base charge | Do not claim a leak repair eliminates this base charge |
| Marietta | January 1, 2026: $19.12 wastewater minimum for 0–2,000 gallons | If both sewer volumes stay inside that minimum, sewer savings can be zero |
Check the provider named on the bill even if your mailing address says Marietta. Cobb County’s Water System and Marietta Power and Water publish different schedules. A city name alone does not establish the utility, customer class or the service rules that apply to your property.
A minimum charge creates another trap. If sewer remains within a billed minimum before and after the repair, lower consumption may not lower that sewer line. Conversely, a larger reduction can move part of the bill out of a higher band. Keep water and sewer calculations separate until the last step.
Match units before calculating. A charge per thousand gallons requires dividing measured gallons by 1,000. If your bill uses cubic feet or another unit, use the utility’s stated conversion. Also use its actual billing period; a 30-day worksheet is a comparison aid, not permission to change the meter dates.
Measure loss before estimating savings
- 1Read the meter safely
EPA’s check compares meter readings across two hours without water use. Record the unit and every displayed digit. Stay clear of flooded electrical areas; ask the utility for help if the meter cannot be accessed safely.
- 2Account for intended use
Avoid faucets, toilets, laundry and irrigation during the interval. Note automatic equipment cycles rather than disabling equipment you do not understand. If something uses water, label the interval interrupted and repeat it.
- 3Read again and keep the times
Subtract the starting reading from the ending reading in the same unit. Divide the difference by elapsed time to find a rate. Movement suggests unexplained use after intentional use is excluded; it does not prove where the fault is.
- 4Use a container only where safe
For a cold faucet drip you can safely catch, record collected volume and elapsed minutes without opening fittings. Divide volume by time. Avoid hot-water collection and pressurized disassembly; call a plumber when the leak cannot be measured safely.
- 5Repeat after the repair
Use another comparable no-use interval and retain both records. A lower meter change supports the measured reduction. A continued change means the report still contains an unresolved source.
A drip count is less certain than a captured volume. USGS says a faucet drip has no scientific standard volume; its calculator assumes one quarter of a milliliter per drip. Different drops can therefore produce different gallon estimates at the same count.
EPA’s familiar once-per-second faucet example exceeds 3,000 gallons annually. Treat that as an illustration, not a calibration for every faucet. Put a drip-count result in the estimated column. When safe collection is possible, your volume and time give a firmer basis for that faucet’s report.
Separate leak repairs from fixture savings
| Observation | Category | Useful next comparison |
|---|---|---|
| Water leaves a closed faucet | Leak | Measured closed-faucet loss before/after repair |
| Tank water reaches the bowl without a flush | Leak | Dye result, overflow condition and refill behavior |
| Working shower uses more than selected baseline | Efficiency opportunity | Measured flow difference × actual shower time |
| Irrigation runs on its intended schedule | Planned use | Schedule and landscape needs, separate from leakage |
| Meter moves with no identified use | Unresolved | Trace equipment cycles and individual fixtures |
A fixture’s rated flow does not establish an annual saving by itself. You still need the existing flow, the proposed flow and time in use. If shower duration changes after a replacement, update the comparison. Do not attach a fixed dollar promise to a showerhead solely because its flow label is lower.
Count hot-water energy separately. The worksheet estimates water and applicable sewer charges. Water-heater fuel, electrical tariffs and mixed-water temperature need another calculation. Also keep repair labor and avoided damage outside the water subtotal so the same dollar is not described as several different benefits.
Check toilets, faucets and outdoor use
Toilet: test before choosing a part
EPA’s method uses a few drops of food coloring in the tank, a 10-minute wait without flushing and a check for color in the bowl. Flush afterward to prevent staining. Color confirms tank-to-bowl leakage; inspect the cause before picking a flapper or fill valve.
Faucet: identify the actual leak
Separate a drip from the spout while closed from water around a handle or supply connection. Record the faucet model before choosing a repair. Shut off its supply according to the maker’s instructions before any disassembly; call a plumber if isolation fails.
Irrigation: compare flow with the schedule
Record which zone runs and when. A scheduled watering cycle can explain a meter change during an attempted no-use test. Persistent unexplained outdoor flow needs diagnosis; do not start digging based on a single meter reading.
Equipment: record automatic cycles
Water-treatment equipment may use water during its programmed cycle. Write the time beside the meter reading and consult its own manual. Leave an unknown cycle unresolved until you know whether the use is intended.
Use our flapper versus fill-valve guide to distinguish the jobs of the toilet’s two parts. A valve refilling the tank can be responding to a leaking seal elsewhere. Replacing the fill valve without that diagnosis can leave the original water loss in place.
If the check points to the fill valve, the toilet fill-valve replacement guide covers fit choices. Keep the toilet’s model, water-level marks and maker instructions with the report. Measure its actual loss before estimating savings from a repair.
When to call a licensed professional
Water near electrical equipment
CDC says never enter standing water to reach a main power switch. Call an electrician for unsafe isolation and qualified inspection of wet equipment. Do not touch the monitor’s power adapter while standing in water.
Main-line cutting or sprinkler piping
Use a licensed plumber for the Flo installation or a concealed main leak. Moen’s instructions require main shutoff and pressure relief before cutting, and list safety glasses. The device must not control a downstream residential fire-sprinkler branch.
Recalled Moen battery backup
Optional model 920-001 is covered by CPSC recall 23-178 for overheating and fire risk. Unplug and stop using it, then contact Moen for the remedy and handling instructions. Do not place the recalled battery in household trash.
Hot water or a valve that will not isolate
Keep this audit observational. Do not loosen hot or pressurized fittings to measure a leak. Follow the equipment maker’s shutoff procedure and have a licensed plumber handle failed isolation or an unresolved concealed leak.
For a broader device comparison after the audit, see automatic water shutoff monitors. Verify your pipe size, power, network and sprinkler arrangement before buying any main-line valve.
Home water waste questions
Is a $500 water bill high?
The total alone cannot identify a leak. Check the number of billing days, the metered volume and which charges the $500 includes. A combined water, sewer and other-service bill is different from a water-consumption charge. Compare the same account’s readings and inspect unexplained flow before drawing a conclusion.
Why am I paying for wastewater?
Your utility’s sewer tariff determines that line. It may use water consumption as the billing basis and may include a minimum. Marietta’s January 2026 table lists a $19.12 minimum for 0–2,000 gallons. A repair that stays within that minimum can reduce water use without reducing the wastewater charge.
How much is a typical water bill for two people?
A two-person count does not establish the utility, fixed charges, billing period or water volume. Use your actual account and consumption history to set a baseline. Compare the avoidable charge using your utility’s tariff and a measured loss.
Why is my water bill almost $200?
Read the consumption and dates before assigning the $200 to leakage. Check for a longer billing interval, a changed tariff, intended outdoor watering and unexplained meter use. If the meter check still shows unexplained flow, record it in the worksheet and investigate the cause. The total bill is not the leak’s cost.
How much water does a dripping faucet waste?
EPA gives an illustrative estimate exceeding 3,000 gallons a year for one drip per second. USGS warns that drop volume has no scientific standard. For your faucet, safely collect cold drips over a timed interval and calculate volume per time; otherwise label the drip-count result an estimate.
How do I measure a leak with a container?
Use a marked container only where a cold-water drip can be caught safely without dismantling a fitting. Record volume and elapsed time in consistent units, then divide volume by time. Do not collect hot water or open a pressurized connection for this test. A plumber can assess an unsafe or inaccessible source.
Why does a calculated leak cost differ from my bill?
The estimate may assume continuous loss, one tariff band or a full sewer charge. Your bill can include rounding, a minimum or fixed fees. Calculate each consumption charge with and without the measured loss, using the utility’s rules for that billing period, and compare the difference rather than the total bill.
Should sewer charges be included in leak savings?
Include only the sewer charge the utility says changes when the extra gallons are removed. Keep it separate from water until the final addition. If the utility has not confirmed how a leak affects sewer billing, mark sewer savings unknown rather than applying the printed rate to every gallon.
Does a positive toilet dye test mean I need a fill valve?
It means tank water reached the bowl without a flush. Check the tank seal, overflow and refill arrangement to identify why. The fill valve and the flush seal do different jobs, so a positive dye test alone does not identify the replacement part. Flush after the test to avoid staining.
Will a smart shutoff pay for itself through water savings?
Moen’s 900-001 provides monitoring and valve control. Payback depends on the actual loss and response, with no guaranteed reduction in billed gallons. Keep device and installation charges separate from the measured water-and-sewer difference. A diagnosed toilet leak still needs its specific repair.
How we calculated the report
Why trust PlumbingPicks
Isaac Daniels is a licensed journeyman plumber in Georgia. We read EPA’s leak guidance, USGS’s drip assumptions, utility tariffs and Moen’s documents for this report. The worked charges are calculations from stated assumptions; the worksheet leaves your household measurements for you to record.
How we pick
We matched Moen’s 900-001 to a main-line monitoring and shutoff job, using its specifications and installation guide. Amazon’s Creators API showed it new and in stock on Oct 22, 2026, 1:10 PM EDT. Product photos come from that API. No customer rating, performance score or product payback estimate is assigned.
| Calculation | Rule | Boundary |
|---|---|---|
| Continuous loss | Gallons/hour × 24 × number of days | Use only when the flow is continuous |
| Fixture opportunity | Maximum of zero or existing minus proposed gpm; × minutes/day × days | Keep separate from confirmed leak loss |
| Avoidable charges | Bill’s consumption charges with loss minus charges without loss | Use actual tier, sewer and rounding rules |
| Whole-home total | Use the meter row to check fixture estimates | Never add meter and fixture losses together |
| Annual projection | Steady daily loss × 365 | Assumes unchanged flow and applicable tariff |
Where the documents need a closer check
| Question | Older specification | Newer installation guide | Our treatment |
|---|---|---|---|
| Outlet distance | 900-001sp Rev. 9/22: within 6 feet | INS11955C 01/25: within 10 feet | Use a location within 6 feet; confirm the supplied revision with Moen |
Ask Moen which installation revision applies to your 900-001 before arranging the work. A location within 6 feet meets both published distance limits; the other electrical and placement requirements still apply.
Sources
- EPA WaterSense, Fix a Leak Week (epa.gov/watersense/fix-leak-week): household leak estimates, meter check, dye test and faucet example. Read October 20, 2026.
- USGS Water Science School, Drip Calculator (water.usgs.gov/edu/activity-drip.html): assumed quarter-milliliter drop and limits. Read October 20, 2026.
- Cobb County Water System, Rates, Fees & Calculator (cobbcounty.gov): water and sewer schedule effective June 1, 2026. Read October 20, 2026.
- Marietta Power and Water, Water & Wastewater Rates (mariettaga.gov/584): rates effective January 1, 2026. Read October 20, 2026.
- Moen 900-001sp specifications, Rev. 9/22, page 1; installation guide INS11955C, 01/25, pages 1, 2 and 6 (assets.moen.com). Read October 20, 2026.
- Moen Solutions, Does the Moen Flo Shutoff need to be professionally installed? (solutions.moen.com). Read October 20, 2026.
- CPSC, Moen Flo Battery Back-Ups recall 23-178, April 13, 2023 (cpsc.gov): model 920-001, hazard and remedy. Read October 20, 2026. Re-searched Oct 22, 2026, 1:11 PM EDT (Moen): no newer Moen recall.
- CDC, What to Do to Protect Yourself From Electrical Hazards, August 26, 2026 (cdc.gov): standing water and wet equipment. Read October 20, 2026.
- Amazon Creators API offer for B00C03D01Q (Moen 900-001): new and in stock, Oct 22, 2026, 1:10 PM EDT. Product photo from the same API.