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Adams County, IL Water Quality

Water quality data for 13 public water systems serving Adams County, Illinois — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 13 water systems · 15 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

Adams County Earns a B

Adams County: 15 communities across 13 water systems. 93.3% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 5 communities with a lead detection, 10 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 2 with significant inspection deficiencies
  • 93.3% of communities have no open violations
2 ppb
Median Lead Level
County-wide, 90th percentile
13
Water Systems
Active CWS & NTNCWS
93%
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
  • Quincy
    2.00 ppb
    No federal limits exceeded on record
    A
  • Mendon
    1.30 ppb
    No federal limits exceeded on record
    A
  • Ursa
    Not detected
    No federal limits exceeded on record
    B
  • Liberty
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Golden
    Not detected
    Copper above the 1,300 ppb action level
    B
⚠ Needs Attention
  • Loraine
    14.70 ppb
    Copper above the 1,300 ppb action level
    F
  • Camp Point
    0.60 ppb
    Copper above the 1,300 ppb action level
    C
  • Payson
    Not detected
    Copper above the 1,300 ppb action level
    B
  • La Prairie
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Lima
    Not detected
    3 health-based violations since 2015
    B
County Lead Level — Median 2 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2 ppb — 13.3% of the federal action level
Systems by Lead Level
Under 5 ppb
4
10 – 15 ppb
1
No Data
10

All Cities in Adams County

Quincy 2.00 ppb A
Camp Point 0.60 ppb C
Payson Not detected B
Mendon 1.30 ppb A
Ursa Not detected B
Liberty Not detected B
Golden Not detected B
Clayton Not detected B
Loraine 14.70 ppb F
Plainville 3.00 ppb B
Fowler Not detected B
Lima Not detected B
Paloma Not detected B
Meyer Not detected B
La Prairie Not detected B
Showing 15 cities
No active violations Active violations

About Adams County Drinking Water

Adams County is served by 13 water systems covering 15 communities. 93% have no open violations.

Of the communities reporting lead results, 5 recorded a detection, with a median of 2.00 ppb — 13% of the federal action level. 10 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 significant deficiencies at 2 of them.

Frequently Asked Questions

Is Adams County tap water safe to drink?▼
93% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Adams County?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 10 reported none detected and 0 reported no result.
How many water systems serve Adams County?▼
13 community water systems serve 15 communities here.
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