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Submetering Apartments in Baltimore County, Maryland

On a master meter, one Baltimore County bill covers every unit and the owner eats it. NES submeters each unit, reads them daily, pays the master-meter bill, and bills your residents for what they use. Get a free bid.

Privately owned since
1968Privately owned since
States served
43+States served
Typical utility savings
15-40%Typical utility savings
In-house support
BilingualIn-house support

NES handles water, gas & electric submetering for apartment communities, condominiums, and mobile home parks across Baltimore County and the Baltimore area. Install, meter reading, resident billing, and compliance, all handled in-house since 1968.

Yes. Submetering is allowed in Baltimore County, Maryland, with some restrictions.

The rules come from Maryland Public Utilities 7-303 and the Maryland PSC, and NES handles them for you.

What we submeter
  • Water & sewer

    Per-unit water and sewer metering with 24-hour leak alerts.

  • Natural gas

    Accurate gas reads and resident billing, kept compliant.

  • Electric

    Electric submetering on nonproprietary meters you own.

Rules & compliance

Submetering rules & laws in Baltimore County

Governing rule: Md. Pub. Util. 7-303 · Maryland PSC

Maryland state rules

  • Submetering of gas and electric in apartment houses is governed by Maryland Public Utilities Article 7-303, and permission must be obtained from the Maryland Public Service Commission before billing residents
  • An owner may only pass through the charges the utility actually imposes, allocated to each unit by its actual usage, with no markup
  • Maryland caps any billing or administrative charge at $1 per unit per month (Public Utilities Article 7-303, kept by HB 220 from October 1, 2026); NES passes through only the charges the utility imposes and adds no fee of its own
  • Water and sewer billing has not been regulated at the state level, though state law requires written disclosures when a ratio formula is used (Md. Real Property 8-212.4) and some counties, including Montgomery County, add their own registration and billing rules
  • From October 1, 2026, Maryland's water submetering law (HB 220, 2026 Ch. 262) sets statewide standards: an administrative fee capped at $1 per unit per month, billing by actual usage, recordkeeping, and state meter standards. NES already bills to those standards
  • Gas RUBS allocation is not allowed in Maryland, except in buildings constructed before 1978 and then only with PSC permission
  • Owners must keep submetering records and let residents inspect them (Pub. Util. 7-303(e)), and NES tracks the current requirements

Local Baltimore County requirements

  • Water and sewer service is supplied through the Baltimore regional system and county utilities
  • Electricity and natural gas are provided by BGE (Baltimore Gas and Electric)
  • We serve communities across Baltimore County, including Towson, Dundalk, Catonsville, Essex, and Owings Mills
  • Rules change. NES tracks Maryland's so you do not have to.

How NES keeps you compliant

  • Tracks every Maryland and local rule that affects your property
  • Handles rate registrations and required filings
  • Keeps audit-ready billing archives
  • Manages tenant disclosures and meter testing
See how NES handles compliance

Official sources: Maryland PSC · Md. Pub. Util. 7-303 · Md. Real Property 8-212.4 · Maryland HB 220 (2026 Ch. 262, water submetering, eff. 10/1/2026)

General information only, not legal advice; NES assumes no liability for reliance. Confirm current rules with the Maryland PSC or a qualified attorney.

Why owners across the Baltimore area choose NES for submetering

  • Per gallon. Residents pay for what they actually use.
  • 15-30%. Lower utility consumption.
  • Under 24 hr. Catch leaks before they cost thousands.

How NES handles it, end to end

  1. Step 1

    Free assessment

    We review your master-meter bills and unit count, then model the recovery. No cost, no obligation.

  2. Step 2

    Install meters

    We install nonproprietary meters at each unit. The equipment is yours, and other companies can read it.

  3. Step 3

    Read & detect

    Daily reads pull usage automatically and flag leaks within 24 hours, before they run up a bill.

  4. Step 4

    Bill & support

    We bill residents, pay the master-meter utility, and field resident questions in-house, in English and Spanish.

Real NES results

140-home community, New MexicoWater & sewer
$264 / yr
owner's annual water and sewer cost, down from $26,400

The owner had been absorbing the whole master-meter bill. After metering each home, residents paid for what they used. Figures from NES property records.

130-home park, TexasWater & sewer
$6,600 / yr
annual water and sewer cost, down from $120,000

The park also gained more than $113,000 in annual revenue once each home was billed for its own use. Figures from NES property records.

Real NES properties. Results vary by property, utility rates, and resident mix.

Submetering in nearby Maryland cities

NES installs and runs submetering across Maryland. See the rules and results for other communities we serve.

Common questions

Submetering apartments in Baltimore County

Utility submetering puts a meter on each unit that measures and bills its water/sewer, gas, and electric use. The technology has been around since the early 1920s. NES installs the meters, reads them, pays the master-meter bill, and bills your residents, all in-house and with bilingual support.

See what your Baltimore County property can recover.

Send us your master-meter bills and unit count. We’ll run the numbers on your actual property and get back to you within one business day with a clear, no-obligation estimate.

  • No-obligation custom proposal
  • Compliance check included
  • Nonproprietary equipment options
Free assessment

Get a free bid for your property

Tell us about your Baltimore County property and we’ll respond within one business day.

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