No health-based violations on EPA record since 2016.
Serves about 25 people (1 connection) with groundwater bought from Harris County MUD 418.
From EPA's record for TX1013727. PurityMap is independent of Harris County MUD 491.
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No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
No lab results for other contaminants (like PFAS) are on file for this system. EPA required that testing from systems serving more than 3,300 people, plus a sample of smaller ones.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
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Follow this water →Harris County MUD 491's phone number on EPA record is 713-623-4531. Its mailing address is 1300 POST OAK BLVD STE 2400, HOUSTON, TX 77056-3044.
According to EPA's record, Harris County MUD 491 uses groundwater bought from Harris County MUD 418.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Harris County MUD 491's latest lead and copper round, which ended in June 2026. The federal action level is 15 µg/L.
PurityMap has no verified website for Harris County MUD 491. Its phone number on EPA record is 713-623-4531. Its mailing address on EPA record is 1300 POST OAK BLVD STE 2400, HOUSTON, TX 77056-3044. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.