Water Quality in South Colby, WA: No Violations — Grade C
Grade C · Score 66/100 · 1 water system · Updated 2026-05-03
South Colby's water has moderate compliance issues. Residents in affected areas should consider filtration.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
What does the EPA compliance record show for South Colby, WA? Zero violations documented across 1 water system, with all health-based and monitoring thresholds met across all available federal records.
Water Quality by ZIP Code in South Colby
Water quality varies across South Colby's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 98384 | C | 66 | 0 | 0 | View report → |
Water Quality Overview
South Colby, Washington receives a water quality grade of C with an overall score of 66 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
No EPA violations have been recorded for the 1 water system serving South Colby. This is a positive indicator, though it does not guarantee the absence of all contaminants — some substances (like PFAS) are not yet fully regulated.
What Grade C Means
A grade of C indicates moderate compliance issues. South Colby's water systems have some violations that warrant attention. While the water may still be safe for most people, residents in affected ZIP codes should consider additional testing or filtration.
Lead Levels
Lead testing data for South Colby is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
Water Systems Serving South Colby
South Colby is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 28,928 people across 1 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
How to Check Your Water in South Colby
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR — your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test — certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration — NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories — monitor your local utility website and local news for boil water advisories or system alerts
South Colby vs. Nearby Washington Cities
How South Colby's water quality compares to similar cities in Washington:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| South Colby | C | 0 | 1 | 28,928 |
| Retsil | C | 0 | 1 | 28,928 |
| Southworth | C | 0 | 1 | 28,928 |
| Maple Valley | B | 4 | 5 | 29,097 |
Common Questions About South Colby Water
These are the most common questions residents search for about water quality in South Colby, Washington:
Is South Colby water hard or soft? Water hardness varies by source. South Colby's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink South Colby tap water? South Colby's water receives a grade of C (66/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for South Colby? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
South Colby vs. Washington Average
Understanding how South Colby compares to the broader Washington average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below — water quality can vary significantly even within South Colby.
ZIP Codes in South Colby
South Colby spans 1 ZIP code. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.