No health-based violations on EPA record since 2016.
Serves about 310 people (186 connections) with groundwater influenced by surface water bought from Rural Water System #1.
From EPA's record for IA8429002. PurityMap is independent of Granville Water Supply.
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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 →Granville Water Supply's phone number on EPA record is 712-727-3365. Its mailing address is ATTN DUANE NIICHEL, PO BOX 114, GRANVILLE, IA 51022.
According to EPA's record, Granville Water Supply uses groundwater influenced by surface water bought from Rural Water System #1.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Granville Water Supply's latest lead and copper round, which ended in December 2025, was 1.4 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for Granville Water Supply. Its phone number on EPA record is 712-727-3365. Its mailing address on EPA record is ATTN DUANE NIICHEL, PO BOX 114, GRANVILLE, IA 51022. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.