States › South Dakota › Deuel County

Deuel County, SD Water Quality

Water quality data for 3 public water systems serving Deuel County, South Dakota — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 3 water systems · 7 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Deuel County Earns a A

Deuel County: 7 communities across 3 water systems. 100.0% have no open violations.

  • Median lead where detected: 13.00 ppb
  • 7 communities with a lead detection, 0 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
13 ppb
Median Lead Level
County-wide, 90th percentile
3
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Clear Lake
    8.00 ppb
    Lead at 8.00 ppb, above a third of the action level
    B
  • Toronto
    13.00 ppb
    Lead at 13.00 ppb, above a third of the action level
    A
  • Goodwin
    13.00 ppb
    Lead at 13.00 ppb, above a third of the action level
    A
  • Astoria
    13.00 ppb
    Lead at 13.00 ppb, above a third of the action level
    A
  • Brandt
    13.00 ppb
    Lead at 13.00 ppb, above a third of the action level
    A
⚠ Needs Attention
  • Gary
    5.00 ppb
    1 health-based violation since 2015
    B
  • Clear Lake
    8.00 ppb
    Lead at 8.00 ppb, above a third of the action level
    B
  • Toronto
    13.00 ppb
    Lead at 13.00 ppb, above a third of the action level
    A
  • Goodwin
    13.00 ppb
    Lead at 13.00 ppb, above a third of the action level
    A
  • Astoria
    13.00 ppb
    Lead at 13.00 ppb, above a third of the action level
    A
County Lead Level — Median 13 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 13 ppb — 86.7% of the federal action level
Systems by Lead Level
5 – 10 ppb
2
10 – 15 ppb
5

All Cities in Deuel County

Clear Lake 8.00 ppb B
Gary 5.00 ppb B
Toronto 13.00 ppb A
Goodwin 13.00 ppb A
Astoria 13.00 ppb A
Brandt 13.00 ppb A
Altamont 13.00 ppb A
Showing 7 cities
No active violations Active violations

About Deuel County Drinking Water

Deuel County is served by 3 water systems covering 7 communities. No community here has an open violation on record.

Of the communities reporting lead results, 7 recorded a detection, with a median of 13.00 ppb — 87% of the federal action level. 0 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Deuel County tap water safe to drink?▼
No community in Deuel County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Deuel County?▼
Among communities with a detection the median is 13.00 ppb, 87% of the 15 ppb action level. 0 reported none detected and 0 reported no result.
How many water systems serve Deuel County?▼
3 community water systems serve 7 communities here.
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