Hydro Irrigation District No 9
EPA ID: WA5335275 · 260 people served · 1 ZIP code
ZipCheckup's reading of EPA records for Hydro Irrigation District No 9 (WA5335275): no drinking-water violations recorded since 2021. Nothing in the federal violation file is listed against Hydro Irrigation District No 9, a system that provides water to roughly 260 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Hydro Irrigation District No 9 Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Hydro Irrigation District No 9 have a median household income of $70,660 and about 42,794 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 68% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Hydro Irrigation District No 9's water is classified in EPA records as a groundwater source. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Washington
System Overview
Hydro Irrigation District No 9 (EPA ID: WA5335275) is a community water system in Washington that serves approximately 260 people from groundwater sources.
This system serves ZIP code 99362 in Walla Walla.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Ask your water utility whether running cold water for 2 minutes is enough to flush your plumbing before drinking.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by WA or modeled from parcel and building-footprint data.
- 99362 - Walla Walla
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Hydro Irrigation District No 9 (WA5335275) on EPA.gov.
Frequently Asked Questions
Is Hydro Irrigation District No 9 water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Hydro Irrigation District No 9 in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Hydro Irrigation District No 9 serve?
Hydro Irrigation District No 9 serves approximately 260 people across 1 ZIP code in Washington.
Where does Hydro Irrigation District No 9 get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Hydro Irrigation District No 9 Water Quality Report, WA. https://zipcheckup.com/water-system/wa5335275/
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author = {{ZipCheckup}},
title = {{Hydro Irrigation District No 9 Water Quality Report, WA}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/wa5335275/}
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