Tap Truth EPA drinking water records, in plain English

Public water system record

Suisun-Solano Water Authority

Serves Suisun City, Solano County, CA · 29,105 people served

Federal records show 11 health-based violations and 1 monitoring/reporting issue for Suisun-Solano Water Authority in the last ten years, including an unresolved LEAD AND COPPER RULE REVISIONS violation.

  • CA4810005
  • VACAVILLE
  • CA
  • 29,105 served

System profile

Source water Surface water
ZIP 95688
EPA system ID CA4810005

Verify this system on EPA ECHO →

Health-based violations, last 10 years
11
Resolved
10
Unresolved
1
Any acute record
No
Monitoring issues, last 10 years
1

Key facts

  • Suisun-Solano Water Authority draws water from 4 surface water intakes.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit), 2024.
  • Most recent formal enforcement: compliance order (no penalty) by California, September 2024.
  • Record on file since 2000, with 1 health-based violation before October 19, 2016.
  • Lead pipe inventory: 0 lead and 1,149 unknown out of 8,452 service lines.

Check whether Suisun-Solano Water Authority serves your address

Address suggestions by Mapbox

Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
LEAD AND COPPER RULE REVISIONS
Treatment technique failure
 350 Oct 17, 2024 Active No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.087 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Jul 1, 2024 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Apr 1, 2024 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.091 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Apr 1, 2024 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.084 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Apr 1, 2024 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
 220 Jan 1, 2024 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.083 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Jan 1, 2024 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.088 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Oct 1, 2023 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.09 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Oct 1, 2023 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Oct 1, 2023 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.082 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Jul 1, 2023 Resolved No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
LEAD AND COPPER RULE REVISIONS
RPT
 Oct 17, 2024 Active

Full record since 2000

EPA's records for Suisun-Solano Water Authority go back to 2000. Before October 19, 2016 they list 1 health-based violation (1 resolved) and no monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
2000s 1 0
2020s 11 1

Most recent health-based violation before October 19, 2016: Surface Water Treatment Rule, began January 2000, Resolved.

Show the health-based violation before October 19, 2016
Contaminant Start date Status
Surface Water Treatment Rule
Treatment technique failure
 Jan 1, 2000 Resolved

Enforcement actions

California regulators took 3 formal enforcement actions against Suisun-Solano Water Authority between 2000 and 2024. The most recent was a compliance order (no penalty) in September 2024.

Date By Action Violations covered
Sep 9, 2024 California Compliance order (no penalty) 6 violations (6 health-based): Total Trihalomethanes (TTHMs)
Nov 28, 2023 California Compliance order (no penalty) 4 violations (4 health-based): Total Trihalomethanes (TTHMs)
Feb 14, 2000 California Compliance order (no penalty) 1 violation (1 health-based): Surface Water Treatment Rule

What the violations mean

Total Trihalomethanes (TTHMs)

10 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

LEAD AND COPPER RULE REVISIONS

1 incident

The system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).

The utility had to notify customers about this violation.

Where the water comes from

Suisun-Solano Water Authority draws water from 4 surface water intakes. It also has an emergency connection to City of Fairfield.

Emergency or part-time connections to

Annual water quality report

Suisun-Solano Water Authority must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by California.

Certified drinking water labs by state EPA guidance for private wells